C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 5cc64127733daae6…

MALICIOUS

PDF

52.2 KB Created: 2011-06-22 18:08:19 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 22c9dde4b90e1a42393048bf2e901339 SHA-1: 2db527e3d7859f36c1cc6f9195c95907fb70f9bd SHA-256: 5cc64127733daae6213892e82be8698542932ec20f8612ffd4777c016f78cac2
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 firing for the CVE-2008-2551 exploit, which is known to download and execute arbitrary code. The embedded URL points to a CAB file that likely contains the exploit and a secondary payload, which in turn downloads 'system.exe' from 'artisanballoonz.com'. This indicates a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3786

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=889420
    • http://www.irna.ir/View/FullStory/?NewsId=889345
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1014879
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1015017
    • http://www.irna.ir/View/FullStory/?NewsId=889420���������������
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1014879���������������
    • http://www.mehrnews.com/fa/newsdetail.aspx?NewsID=1015017������
    • 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_off000012ad.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12AD 73272 bytes

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