C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 1bd3d7d8898daec6…

MALICIOUS

PDF

57.4 KB Created: 2011-06-22 17:51:43 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 1e5f2d7856ea4ad4189643b127db9578 SHA-1: 6cd7fe0a694a6658da7f4d59f1e595b66b6fdfb8 SHA-256: 1bd3d7d8898daec6d985965d24acdabb1f881337757e67e0828a76a6ecd10dd3
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1204.002 Malicious File T1204 User Execution T1059.001 PowerShell

The PDF file contains a critical heuristic firing for the CVE-2008-2551 C6 Messenger DownloaderActiveX exploit. This indicates the file is designed to leverage this vulnerability to download and execute a secondary payload. While several URLs are present, they are all marked as confirmed benign, suggesting the primary malicious functionality relies on the exploit itself rather than directing the user to a malicious site for download.

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.farsnews.com/newstext.php?nn=8903231748
    • http://www.presstv.ir/detail.fa.aspx?id=130281&sectionid=351021501
    • http://www.presstv.ir/detail.fa.aspx?id=130195&sectionid=351021504
    • http://www.presstv.ir/detail.fa.aspx?id=130218&sectionid=351021504
    • http://www.presstv.ir/detail.fa.aspx?id=130215&sectionid=351021504
    • http://www.irna.ir/View/FullStory/?NewsId=1175587
    • http://www.farsnews.com/newstext.php?nn=8903240058
    • http://www.farsnews.com/newstext.php?nn=8903231714
    • http://www.irna.ir/View/FullStory/?NewsId=1175455
    • http://www.farsnews.com/newstext.php?nn=8903221309
    • http://www.irna.ir/View/FullStory/?NewsId=1175575
    • http://www.presstv.ir/detail.fa.aspx?id=130304&sectionid=351021507
    • http://www.presstv.ir/detail.fa.aspx?id=130255&sectionid=351021507
    • 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_005_off000026d0.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26D0 73272 bytes

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