C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 6801b98ecb5086bf…

MALICIOUS

PDF

54.1 KB Created: 2011-05-17 08:56:10 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 2bb89853fbd7bdb16cec334323d87f47 SHA-1: 30840782d02b0c6972efa90f236421971d5a8dc8 SHA-256: 6801b98ecb5086bfaaa794dedfa244d30cb4cf5794cab6f2627f5e2711d834eb
94 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF file contains an exploit for CVE-2008-2551, which is known to be used by the C6 Messenger Downloader. The exploit likely facilitates the download of a second-stage payload from an external URL. While several benign URLs are present, the critical heuristic firing indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7509

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=8903170976
    • http://www.irna.ir/View/FullStory/?NewsId=1162985
    • http://www.irna.ir/View/FullStory/?NewsId=1163118
    • http://www.irna.ir/View/FullStory/?NewsId=1163090
    • http://www.irna.ir/View/FullStory/?NewsId=1160973
    • http://www.farsnews.com/newstext.php?nn=8903171179
    • http://www.farsnews.com/newstext.php?nn=8903171215
    • http://www.presstv.ir/Persian.aspx?id=10509
    • http://www.presstv.ir/Persian.aspx?id=10513
    • http://www.presstv.ir/Persian.aspx?id=10507
    • http://www.irna.ir/View/FullStory/?NewsId=1163152
    • http://www.irna.ir/View/FullStory/?NewsId=1163128
    • http://www.irna.ir/View/FullStory/?NewsId=1163104
    • http://www.farsnews.com/newstext.php?nn=8903170976������������������
    • http://www.irna.ir/View/FullStory/?NewsId=1162985�����������������������������
    • http://www.irna.ir/View/FullStory/?NewsId=1163118���������������
    • http://www.irna.ir/View/FullStory/?NewsId=1163090���������������������
    • http://www.farsnews.com/newstext.php?nn=8903171179������������
    • http://www.farsnews.com/newstext.php?nn=8903171215������������������
    • http://www.irna.ir/View/FullStory/?NewsId=1163152��������������������
    • http://www.irna.ir/View/FullStory/?NewsId=1163128���������������������������
    • 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_off00001a07.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A07 73272 bytes

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