C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 baaf204fcc6c8b01…

MALICIOUS

PDF

56.8 KB Created: 2011-06-22 17:40:01 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 9b8d04d25376cd486a2b6fffa229ae6b SHA-1: 7c3b2c3c4041640e242d077c98d4300ec458bec7 SHA-256: baaf204fcc6c8b01ab46b4c3718eeb2f43426daf7fd731f8e32e4748f2992ff5
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

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

The sample is a PDF document that exploits the CVE-2008-2551 vulnerability. This exploit is known to download and execute a second-stage payload. The heuristic firing directly indicates the exploit used. An unknown reputation URL was extracted, which is highly suspicious in this context.

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=1039388
    • http://www.farsnews.com/newstext.php?nn=8901171116
    • http://www.farsnews.com/newstext.php?nn=8901171312
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1058406
    • http://www.farsnews.com/newstext.php?nn=8901171386
    • http://www.presstv.ir/Persian.aspx?id=8997
    • http://www.presstv.ir/Persian.aspx?id=8989
    • http://www.presstv.ir/Persian.aspx?id=8993
    • 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_006_off00002449.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2449 73272 bytes

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