This botnet’s purpose is to add referrer links to your Google Analytics, in the hopes that the webmaster or site owner will click on the link. They will then be exposed to an internet virus. Please do not click on any referrer spam link, as it is dangerous. I always copy the link and paste it into Google search first, to see if the site is dangerous.
Get, I do, a lot of referrer spam on my site. I’m pretty sure that every site gets referrer spam, they are ubiquitous. Usually I have already banned them and they are usually from Russia, such as xrus, dealing with lovely, nubile, young Russian women. These I treat like background noise: I glance at the error 403 and move on. Then occasionally, about once a month, I get a bona fide referrer spam marketing campaign, where someone really wants to make a negative impression on both my Google Analytics and myself. I then find and ban them.