|21 Apr 2010||#1|
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Postal-themed PDF Spam
The Bredo malware-spammers are back, and they’ve been reading about how to run executable files from a PDF using /Launch, a trick we’d already started to see used by malware. This latest spam campaign uses this technique (it’s not really exploiting a vulnerability as such, since PDFs were specifically designed to be able to do this) in a slightly modified format.
Messages started coming in last week targeting the Brits, with subject lines such as “IMPORTANT: Royal Mail Delivery Invoice #1092817″ sent from “Royal Mail <email@example.com>” and content such as:
We missed you, when trying to deliver.Later in the week we saw it change to a more Canadian theme, with subjects including “IMPORTANT: Canada Post Delivery #9381747173″ from “Canada Post <firstname.lastname@example.org>” and extremely similar content:
We missed you, when trying to deliver!This week they even remembered they shouldn’t be discriminating against French-speaking Canadians:
We missed you, when trying to deliver!The actual attachments are PDF files, which is quite unusual for spam containing malware, and maybe that’s what the bad guys were relying on - there are still many people out there who mistakenly think of PDF as being a “safe” format.
If you open the PDF, called a variation on “Royal_Mail_Delivery_Invoice_1092817.pdf”, “CanadaPost_April_2010_Invoice.pdf” or “Canada_Post_Delivery_102837645167.pdf”, you get presented with the following dialog box (click on the image to enlarge it):
This is asking you if you want to save an attachment, in this case CanadaPost_Invoice_Notice_9381747173.pdf, to the same folder as you opened the original PDF. This is the step that makes these PDFs different from the previous PDF malware we’ve seen using this technique. And although it looks like you’re saving another PDF, it’s actually an executable file with a misleading filename.
Postal-themed PDF Spam | SophosLabs blog
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