Poisoned AdWords Links

If one instance has been spotted, there could be many instances. Basically, just because it is a sponsored link in Google, it doesn't mean you should trust it in any way. In fact, based in this, you should probably avoid clicking on these ads altogether, unless you are totally confident you have a bullet-proof PC, or until Google addresses this problem:

if you ran a Google search for "BetterBusinessBureau" from April 10 through [today], you'd have stood a one in three chance of seeing a top sponsored link with green link text that read www.bbb.org - just like the real search result. If you clicked that sponsored link, you'd even end up at the regular BBB site as per normal.

But before you got to the bbb.org site, you'd invisibly pass through a malicious site that would try to exploit an Internet Explorer browser hole...

You'd have had no idea that you passed through the poisoned site on your way to the BBB - or that if your PC lacked a critical security patch, the site would have surreptitiously downloaded malware onto your computer meant to steal banking credentials. [Infostealer.Bancos]