Spam Types: The 3 Most Dangerous Disturbances (2023)

By Tibor Moes / Updated: June 2023

Spam Types: The 3 Most Dangerous Disturbances (2023)<br />

Spam Types

Ever driven down a highway only to have your scenic view blocked by billboard after billboard? These interruptions are a bit like what happens in the online world with spam. It’s those unsolicited messages that blot out your online landscape, filling your inbox or comment section with offers, information or requests you didn’t ask for. Join us as we explore the colorful, irritating, and sometimes surprising world of spam.


Spam refers to unsolicited, often irrelevant or inappropriate messages sent on the internet to a large number of users, generally for advertising, phishing, spreading malware, or other disruptive purposes.

Type 1 – Image Spam: This type of spam cleverly circumvents text-based spam filters by embedding the spam message within an image. These images might appear as advertisements, lottery wins, or unsolicited offers, but are in fact a sneaky way to get past your defenses.

Type 2 – Spamdexing: This is a more insidious form of spam, which manipulates search engine indexes to promote a site or product. It skews the ‘organic’ results you might be looking for by artificially boosting the rankings of particular web pages.

Type 3 – Snowshoe Spam: Like a snowshoe disperses a person’s weight over a large area to avoid sinking in the snow, this spam is spread across many IP addresses and domains to avoid detection. It’s one of the most sophisticated types of spam, reflecting the perpetual cat-and-mouse game between spammers and those trying to stop them.

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Spam Types In-depth

Image Spam: The Digital Wolf in Sheep’s Clothing

Remember playing peek-a-boo as a kid? The thrill of hiding and then suddenly appearing, making everyone burst into laughter? Well, in the digital world, image spam operates somewhat similarly, but it’s no laughing matter. It’s the digital version of a wolf in sheep’s clothing, hiding its true intent behind seemingly harmless images.

Image spam is like the chameleon of the digital jungle, a master of disguise. Spammers use it as a clever trick to bypass traditional text-based spam filters. How does it work? Simple. Instead of sending you a text-filled message that can easily be caught by the spam filter, spammers embed their message within an image. It’s like hiding a secret note inside a picture.

These images might show up in your inbox looking like advertisements, informing you about an amazing deal, or congratulating you for winning a lottery you never entered. The graphics can be appealing, designed to catch your eye and make you curious. But beware! The devil is in the details. The underlying purpose of these messages is not to offer you a deal, but to lure you into taking action—like clicking on a link, or sharing personal information—that you wouldn’t normally consider.

It’s also important to note that these images don’t necessarily have to be pictures or photos. They can be screenshots of text, pictures of handwritten notes, or stylized text created as an image file. These are all designed to bypass spam filters that are on the lookout for suspicious textual patterns.

Defending against image spam can be tricky. Since it’s image-based, it can easily slip through the net of text-based spam filters. But there’s hope. Modern spam filters are getting smarter, using techniques like optical character recognition (OCR) to ‘read’ the text inside images. This way, they’re gradually learning to catch these crafty spammers.

In the meantime, remember the old adage: “If it seems too good to be true, it probably is.” Don’t let the glitter of image spam fool you. If you receive an unsolicited image with a message that seems suspicious, it’s best to err on the side of caution and avoid clicking on it. Remember, in the digital jungle, it’s always better to be safe than sorry.

Spamdexing: The Crafty Puppeteer of Search Engines

Ever stumbled upon a magician’s trick, where he cleverly manipulates a deck of cards to control which card you pick? In the digital realm, there’s a similar kind of manipulation going on called “spamdexing”. But instead of a magic show, the stage is the vast landscape of search engine results, and the magician is a crafty spammer trying to control which sites you see first.

The word “spamdexing” is a hybrid of ‘spam’ and ‘indexing’. It’s a shady technique used to manipulate search engine indexes to artificially inflate a site or product’s ranking. Much like a puppeteer pulling the strings behind a puppet show, spamdexing manipulates the behind-the-scenes algorithm of search engines to boost the visibility of certain websites.

Why would someone do this? It’s all about visibility. The higher a site ranks on a search engine results page (SERP), the more likely you are to click on it. By manipulating search engine rankings, spamdexers can increase traffic to their website or a particular product page.

There are a few different ways spamdexers go about this. One is ‘keyword stuffing’, which involves overloading a webpage with certain keywords to trick search engines into thinking the page is highly relevant to those terms. Another tactic is ‘invisible text’, where spamdexers hide a bunch of keywords in the page’s code or make the text the same color as the background so it’s not visible to visitors but still scanned by search engines.

You might be wondering: aren’t search engines smart enough to catch these tricks? The answer is yes and no. Search engines like Google have complex algorithms designed to catch and penalize spamdexing. They’re constantly improving and learning to recognize these manipulative tactics. However, it’s a bit like an endless game of cat-and-mouse, where spamdexers are always looking for new ways to trick the system, and search engines are continually adapting to catch them.

So next time you’re surfing the internet, remember there might be a digital magician trying to manipulate which cards you pick, or in this case, which search results you click on. Stay informed and be aware of the tricks of the trade. Because in the digital world, the hand is often quicker than the algorithm.

Snowshoe Spam: The Master of Digital Hide-and-Seek

Have you ever seen those shoes designed for walking on snow, the ones that look like tennis rackets for your feet? They distribute your weight over a larger surface area, allowing you to walk on snow without sinking. In the world of spam, there’s a technique named after these snowshoes that’s just as cunning and ingenious.

“Snowshoe spam” is a sophisticated technique where spammers distribute their messages across many IP addresses and domains, just as a snowshoe distributes your weight to prevent you from sinking. By spreading out their spam in this manner, these digital tricksters make it much more difficult for spam detection systems to catch them.

Imagine playing a game of hide-and-seek, but instead of just one person hiding, it’s a whole crowd. That’s what spam detection systems are dealing with when it comes to snowshoe spam. The messages are coming from everywhere, making it difficult to pinpoint where the spam is originating from or which direction the next one will come from.

Why is it effective? Well, most spam filters track the sender’s reputation to decide if an email is spam. If an IP address or domain sends too many spam emails, it gets a bad reputation and ends up being blocked. However, by using the snowshoe technique and spreading the spam across many IPs and domains, spammers make it hard for spam filters to block them without also blocking legitimate emails. It’s like trying to swat a fly that never lands in one place for long.

However, the battle against snowshoe spam is not lost. Advanced spam detection systems are now using machine learning and artificial intelligence to recognize the patterns used by snowshoe spammers. They’re getting better at picking out the spammers from the crowd and filtering out their messages.

So, while snowshoe spam is a tricky opponent in the war against spam, it’s not invincible. With constant improvements in technology and a better understanding of how spammers operate, we’re gradually winning the hide-and-seek game against snowshoe spam. As they say, in the digital world, the game is always on, and every player needs to keep evolving.


In the digital labyrinth of the internet, spam stands as an uninvited guest, often masking its true face behind various forms. From image spam that fools the eye to spamdexing that tries to influence your choices, to the elusive snowshoe spam playing an intense game of hide-and-seek, these are just some examples of how spam makes its way into our virtual lives. However, as we become more aware and tech-savvy, we’re continually learning ways to navigate and combat these nuisances. With time and advancements in technology, the dream of a spam-less digital world doesn’t seem too far-fetched!

How to stay safe online:

  • Practice Strong Password Hygiene: Use a unique and complex password for each account. A password manager can help generate and store them. In addition, enable two-factor authentication (2FA) whenever available.
  • Invest in Your Safety: Buying the best antivirus for Windows 11 is key for your online security. A high-quality antivirus like Norton, McAfee, or Bitdefender will safeguard your PC from various online threats, including malware, ransomware, and spyware.
  • Be Wary of Phishing Attempts: Be cautious when receiving suspicious communications that ask for personal information. Legitimate businesses will never ask for sensitive details via email or text. Before clicking on any links, ensure the sender's authenticity.
  • Stay Informed. We cover a wide range of cybersecurity topics on our blog. And there are several credible sources offering threat reports and recommendations, such as NIST, CISA, FBI, ENISA, Symantec, Verizon, Cisco, Crowdstrike, and many more.

Happy surfing!

Frequently Asked Questions

Below are the most frequently asked questions.

Why can't we just block all spam messages?

Blocking all spam is a difficult task because spammers are always evolving their techniques to bypass spam filters. Moreover, spam filters need to strike a delicate balance between catching spam without blocking legitimate messages, which can sometimes be challenging.

What can I do to protect myself from spam?

There are several steps you can take: avoid opening suspicious emails, especially those from unknown senders; don’t click on suspicious links; use strong, unique passwords; keep your software updated; and consider using a reputable spam filter. Educating yourself about the different types of spam can also help you recognize potential threats.

How do spam filters work?

Spam filters work by analyzing incoming emails and scoring them based on various factors, such as the reputation of the sender, the presence of suspicious links or keywords, and the structure of the email. Emails that score above a certain threshold are then classified as spam. Some advanced filters also use machine learning to adapt to new spam techniques.

Author: Tibor Moes

Author: Tibor Moes

Founder & Chief Editor at SoftwareLab

Tibor is a Dutch engineer and entrepreneur. He has tested security software since 2014.

Over the years, he has tested most of the best antivirus software for Windows, Mac, Android, and iOS, as well as many VPN providers.

He uses Norton to protect his devices, CyberGhost for his privacy, and Dashlane for his passwords.

This website is hosted on a Digital Ocean server via Cloudways and is built with DIVI on WordPress.

You can find him on LinkedIn or contact him here.

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