C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 0607ed850779a474…

MALICIOUS

PDF

51.5 KB Created: 2011-06-22 17:02:16 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 03cb4469d67dba8543df3f4e8d4266b8 SHA-1: f2524b6b642d916fd9602e946aa3875fe7ceb9d7 SHA-256: 0607ed850779a474d9efd9aa88571a44d765a9df5d1279449c488944696c68ad
64 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2008_2551 indicates the sample is designed to exploit this vulnerability. The presence of an embedded URL pointing to a CAB file and another URL that likely hosts a payload (system.exe) strongly suggests a downloader functionality. The exploit is used to achieve initial execution, leading to the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3775

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://www.irna.ir/View/FullStory/?NewsId=840728������
    • http://www.farsnews.com/newstext.php?nn=8809221138���������������������
    • 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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