C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 6858086c4b0f5b7b…

MALICIOUS

PDF

54.2 KB Created: 2011-04-22 21:47:51 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 64b764e6d5b8463bacd29489b4bce7ab SHA-1: ed0ee3531d87f12b286a7432e3bd42b0a1fa6b1d SHA-256: 6858086c4b0f5b7bc50606a1699ba859cb2a2a49d2d4fad36aaf7e7c8cd049e2
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file that contains a marker for the CVE-2008-2551 exploit, which is known to be used by the C6 Messenger Downloader. This exploit likely facilitates the download and execution of a secondary payload. While numerous benign URLs were extracted, the presence of the exploit heuristic is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3934

Heuristics 2

  • 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.
  • 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=8902141425���������������������������������
    • http://www.farsnews.com/newstext.php?nn=8902141247���������
    • http://www.farsnews.com/newstext.php?nn=8902140438���������
    • http://www.irna.ir/View/FullStory/?NewsId=1096880
    • http://www.irna.ir/View/FullStory/?NewsId=1096186���������
    • http://www.irna.ir/View/FullStory/?NewsId=1096871������������������������������
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1076851���������
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1076890
    • http://www.presstv.ir/Persian.aspx?id=9677������������������
    • http://ilna.ir/newsText.aspx?ID=121795������������������������
    • http://www.presstv.ir/Persian.aspx?id=9668���������������������
    • http://www.presstv.ir/Persian.aspx?id=9673
    • http://www.presstv.ir/Persian.aspx?id=9676
    • http://www.presstv.ir/Persian.aspx?id=9675���������������������
    • http://www.presstv.ir/Persian.aspx?id=9672������
    • 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_002_off00001a5e.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A5E 73272 bytes

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