My web site recently started periodically interrupting navigation by redirecting users to advertising pages hosted by Go.goadvs.com. Needless to say, I was not pleased.
Go.goadvs.com is a notorious example of the “advertising spam” category of malware. Generally, it infects people’s browsers by installing its own browser extension.
However, in this particular case, I traced it to the SiteMeter widget that I’ve been using since 2010. It’s clearly been compromised in some way, so I’ve removed it from the web site.