In this new spam campaign, messages are being sent to German internet users encouraging them to read an attached PDF file which urges them to invest in stock in a company called Talktech Media, who are listed on the Frankfurt stock exchange. In examples, the PDF file carries the bizarre name sexy_ganja_report.pdf.
Internet users may not be aware that the spammers are likely to have already purchased stock at a cheap price and are trying to artificially inflate its price by encouraging others to purchase more. The spammers plan to then sell off their stock at a profit, which may cause the price to plummet.
"Internet users without anti-spam protection are probably used to seeing messages in their inbox telling them to buy shares in companies they've never heard of, but usually the promotions are in the form of regular text or an embedded image," said Graham Cluley, senior technology consultant for Sophos. "In an attempt to get past anti-spam filters criminals are now using PDF file attachments to carry their slick enticements for people to invest. The positive news is that a good anti-spam defense can protect against this nuisance, but the rewards for this kind of crime mean that spammers are unlikely to stop their pump-and-dump scams anytime soon."
