Tuesday, April 14, 2009

Adultsite contain malware drive-by downloads

One of AdultSite which sit ~31K ranking in Alexa contain drive-by download malicious file for PDF exploit and SWF exploit. The maliciou website have timeout detection mechanism, and it make me harder to further analysis the malicous file after a period of time. Obfuscating the multiple layers to get the url link is tedious process and time consuming.

From early analysis, the js script on that adult website was suspect altered and contain malicious link after unescaped hence the malicous site contain like this. It using ActiveX object AcroPDF.pdf and PDF.PdfCtrl to detect for pdf and use Active object ShockwaveFlash.ShockwaveFlash.9 for flash swf detection.



Based on code above, it showed links to download malicous pdf file and swf file. Once pdf file was opened, javascript that contained inside pdf will pointing to same malicous website and download another malicous file and inject using shellcode.







Conclusion here is, please get the latest update for PDF reader and Flash. And remember switch to latest Firefox browser with NoScript plugin installed.

1 comments:

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