C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 91b8d85ba4dae7f7…

MALICIOUS

PDF

53.6 KB Created: 2011-05-26 13:14:04 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: b4709b0d0d39e75d9f17ec90a2f71e15 SHA-1: 231bc24022d28c7657f340120915ffcc4fe61dcc SHA-256: 91b8d85ba4dae7f7dcf9b758f0ede60fcffc3d5a8e2eec3413dccf145978dc18
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 85%

The sample is a PDF file that contains a critical heuristic firing for the CVE_2008_2551 exploit, which is associated with the C6 Messenger Downloader. This exploit is designed to download and execute a second-stage payload. The presence of an embedded URL pointing to 'DownloaderActiveX.cab' further supports this. An additional URL, 'http://artisanballoonz.com/system/system.exe', is also present and likely serves as the download location for the malicious payload.

Heuristics 3

  • C6 Messenger DownloaderActiveX exploit critical CVE exact CVE_2008_2551
    PDF stream bytes contain HTML/ActiveX content configuring the vulnerable C6 Messenger DownloaderActiveX control with propDownloadUrl and propPostDownloadAction=run. This is the published exploit shape for CVE-2008-2551.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://artisanballoonz.com/system/system.exe
    • http://www.irna.ir/View/FullStory/?NewsId=843295
    • http://www.farsnews.com/newstext.php?nn=8809231839
    • http://www.irna.ir/View/FullStory/?NewsId=842976
    • http://www.irna.ir/View/FullStory/?NewsId=840723
    • http://www.irna.ir/View/FullStory/?NewsId=843385
    • http://www.irna.ir/View/FullStory/?NewsId=842924
    • http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00001828.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1828 73272 bytes

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