In his Countermeasures security blog posting, Ferguson said that Trend's research team has seen both malicious PDF documents and executable files from this attack scenario.
"These Trojans attempt to connect to additional locations to download further malware. TrendLabs are currently investigating the situation", he said.
According to Ferguson, this latest Twitter malspam attack follows hot on the heels of the Gaza and FIFA spam run of earlier in June. "Be careful where you click and make sure your security software is blocking those evil links", he said.
Trend Micros's warning has been picked up by fellow IT security researcher Chris Boyd over at Sunbelt Software, who noted that "there appears to be a bit of a mad dash to infect people by the boatload on Twitter, with a variety of different messages being sent to random targets."
One of the PDF exploits, says Boyd, has turned out to be exploit.PDF-JS.Gen (a well-known virus, Infosecurity notes).
"This isn't the first malicious spamrun on Twitter, and it certainly won't be the last. With that in mind, it might be best to avoid random links sent to you from strangers. You never quite know what's at the other end", he said.