C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 f8c995cb6db517d4…

MALICIOUS

PDF

51.5 KB Created: 2011-05-26 13:45:17 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: c0f8a453f0db2569baaf36c6bde09c1e SHA-1: d07af87f81c3551ec05e4536bc72c19608209dc3 SHA-256: f8c995cb6db517d49e892b5c3ec1504640f248a79ee37fd85560068925d3fc9d
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1204.002 Malicious File

The sample is a PDF file that contains a critical heuristic firing for the CVE_2008_2551 exploit, which is known to download and execute payloads. The embedded URL points to a CAB file, likely containing the DownloaderActiveX exploit, and another URL is present that likely hosts the second-stage executable. The file is attributed to the C6 Messenger Downloader family based on the exploit name.

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=840728
    • http://www.farsnews.com/newstext.php?nn=8809221138
    • http://www.irna.ir/View/FullStory/?NewsId=839237
    • http://www.farsnews.com/newstext.php?nn=8809221807
    • 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_001_off00000fe2.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE2 73272 bytes

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