C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 0ccb11a2081ddea4…

MALICIOUS

PDF

60.8 KB Created: 2011-07-07 20:38:22 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 755c89cd220a26242bab0985ae95e99a SHA-1: 3060e257455a14af235679e6e034b33e8f3cd563 SHA-256: 0ccb11a2081ddea41ac0efc1cdae17dd351df9868431b8bee7d36ad4761570f1
64 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file that contains a critical heuristic firing for the CVE-2008-2551 C6 Messenger DownloaderActiveX exploit. This exploit is designed to download and execute a second-stage payload from a remote location. Several URLs were extracted from the document, some of which are associated with news websites, but the primary threat stems from the exploit itself.

Machine Learning

  • Nyx PDF Classifier clean score 0.1482

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://www.rajanews.com/detail.asp?id=49387
    • http://www.rajanews.com/detail.asp?id=49387���������������
    • http://artisanballoonz.com/system/system.exe
    • http://www.irna.ir/View/FullStory/?NewsId=1095402
    • http://www.farsnews.com/newstext.php?nn=8902131570
    • http://www.irna.ir/View/FullStory/?NewsId=1094497
    • http://www.irna.ir/View/FullStory/?NewsId=1094349
    • http://www.irna.ir/View/FullStory/?NewsId=1094488
    • http://www.irna.ir/View/FullStory/?NewsId=1094484
    • http://www.irna.ir/View/FullStory/?NewsId=1094490
    • http://www.irna.ir/View/FullStory/?NewsId=1095417
    • http://www.irna.ir/View/FullStory/?NewsId=1095146
    • http://www.irna.ir/View/FullStory/?NewsId=1094491
    • http://www.irna.ir/View/FullStory/?NewsId=1094468
    • http://www.irna.ir/View/FullStory/?NewsId=1095402������
    • http://www.farsnews.com/newstext.php?nn=8902131570������
    • http://www.irna.ir/View/FullStory/?NewsId=1094497������
    • http://www.irna.ir/View/FullStory/?NewsId=1094349������
    • http://www.irna.ir/View/FullStory/?NewsId=1094488������
    • http://www.irna.ir/View/FullStory/?NewsId=1094484������
    • http://www.irna.ir/View/FullStory/?NewsId=1094490������
    • http://www.irna.ir/View/FullStory/?NewsId=1095417������
    • http://www.irna.ir/View/FullStory/?NewsId=1095146���������������������������������
    • http://www.irna.ir/View/FullStory/?NewsId=1094491������
    • http://www.irna.ir/View/FullStory/?NewsId=1094468������
    • 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_010_off00003363.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3363 73272 bytes

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