C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 17fd361054619030…

MALICIOUS

PDF

53.9 KB Created: 2011-05-26 12:59:21 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 922a1bb8fc7bbaa0887272ff5a2f1828 SHA-1: 0c1c3305a67a28dc244a1ccf278209463a8c87ce SHA-256: 17fd36105461903073b200bdc35b2387a07be8183d3707deaa4c67018dc1ae02
64 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic indicating an exploit for CVE-2008-2551, known to be used by the C6 Messenger Downloader. This exploit likely facilitates the download of a second-stage payload from an external URL. The embedded URLs, while mostly benign, are part of the document's structure that facilitates the exploit.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4962

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=8902120866
    • http://www.irna.ir/View/FullStory/?NewsId=1092023
    • http://www.farsnews.com/newstext.php?nn=8902121781
    • http://www.farsnews.com/newstext.php?nn=8902121516
    • http://www.farsnews.com/newstext.php?nn=8902130126
    • http://www.farsnews.com/newstext.php?nn=8902130200
    • http://www.presstv.ir/Persian.aspx?id=9626
    • http://www.presstv.ir/Persian.aspx?id=9628
    • http://www.farsnews.com/newstext.php?nn=8902120866������
    • http://www.irna.ir/View/FullStory/?NewsId=1092023������
    • http://www.farsnews.com/newstext.php?nn=8902121781������
    • http://www.farsnews.com/newstext.php?nn=8902130126������������������������������
    • http://www.presstv.ir/Persian.aspx?id=9626���������������������������������
    • 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_003_off00001925.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1925 73272 bytes

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