BKIS the security vendor in Vietnam cautions of scareware (fake anti-virus) purveyors who are spreading malicious web-links on portals for Q&A (questions and answers), which take users' onto spoofed Yahoo Answers websites.
Essentially, leading onto a .tk web-domain, which has "answers" and "yahoo" as words within its name, the domain serves a message containing the same words, while either stating that the URL http://answers-yahoo-z.tk is likely to help the visitor, or that the visitor may get the answer from a link (as given).
But on hitting these web-links, a site opens up that resembles the Yahoo Answers site prompting the visitor to take down the answer that, however, is an .exe document.
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