C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 6b8dd8a5c9867d62…

MALICIOUS

PDF

52.2 KB Created: 2011-06-26 00:19:52 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: aa91ea05c5c2cc2b2109e83531f39b63 SHA-1: 8419255f0f0b187dcdcf9de98a151cc627bd137e SHA-256: 6b8dd8a5c9867d620a91555e61129fae2f3705fe55cb004eb3bc5646ced462a8
64 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 critical heuristic firing for the CVE-2008-2551 exploit, which is known to download and execute payloads. The embedded URL points to a CAB file, and another URL is present that likely hosts the second-stage executable. This indicates a downloader 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_off000012d5.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D5 73272 bytes

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