C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 91651adb638c629d…

MALICIOUS

PDF

54.7 KB Created: 2011-06-22 17:40:13 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: a703cdfc4bc072d9f9bcbc9abee9e96f SHA-1: c2da4f08e3e394bb84b9747358dd08048248e6fe SHA-256: 91651adb638c629d257e247055f6f813ea253cf90c0b973910494ed99cfd335f
62 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 85%

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

The PDF file contains a critical heuristic firing for CVE-2008-2551, indicating it exploits a vulnerability to download a payload. The embedded URL points to a CAB file which likely contains the ActiveX control for the exploit. Another URL, http://artisanballoonz.com/system/system.exe, is also present and has an unknown reputation, suggesting it may be the secondary payload.

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.iribnews.ir/Default.aspx?Page=MainContent&news_num=227087
    • http://www.farsnews.com/newstext.php?nn=8903021701
    • http://www.iribnews.ir/Default.aspx?Page=MainContent&news_num=227089
    • http://www.iribnews.ir/Default.aspx?Page=MainContent&news_num=227098
    • http://www.presstv.ir/Persian.aspx?id=10147
    • http://www.iribnews.ir/Default.aspx?Page=MainContent&news_num=227078
    • http://www.presstv.ir/Persian.aspx?id=10143
    • http://www.presstv.ir/Persian.aspx?id=10149
    • 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_off00001c2a.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C2A 73272 bytes

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