C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 09a049b3f9733482…

MALICIOUS

PDF

57.0 KB Created: 2011-05-17 09:02:38 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 2cfe1a5e85238cef05ed506d6b0c26db SHA-1: e6b051d1fea4c107ec0880690f1e58abd3f0dd96 SHA-256: 09a049b3f97334826104cf85c99981f4706da4f2534c8eee3b4dc096b839d599
94 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 85%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by an ML classifier and contains a known exploit for CVE-2008-2551, which is associated with the C6 Messenger Downloader. This exploit likely facilitates the download and execution of a secondary payload. While numerous benign URLs are present, the critical heuristic points to the exploit's presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6293

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=1201393
    • http://www.irna.ir/View/FullStory/?NewsId=1201495
    • http://www.irna.ir/View/FullStory/?NewsId=1201438
    • http://www.farsnews.com/newstext.php?nn=8904061155
    • http://www.presstv.ir/detail.fa.aspx?id=132487&sectionid=351021501
    • http://www.presstv.ir/detail.fa.aspx?id=132417&sectionid=351021505
    • http://www.presstv.ir/detail.fa.aspx?id=132418&sectionid=351021501
    • http://www.presstv.ir/detail.fa.aspx?id=132388&sectionid=351021508
    • http://www.presstv.ir/detail.fa.aspx?id=132478&sectionid=351021504
    • http://www.presstv.ir/detail.fa.aspx?id=132427&sectionid=351021507
    • http://www.presstv.ir/detail.fa.aspx?id=132444&sectionid=351021507
    • http://www.irna.ir/View/FullStory/?NewsId=1201600
    • http://www.irna.ir/View/FullStory/?NewsId=1201590
    • http://www.farsnews.com/newstext.php?nn=8904071534
    • http://www.irna.ir/View/FullStory/?NewsId=1201393������
    • http://www.irna.ir/View/FullStory/?NewsId=1201495������
    • http://www.irna.ir/View/FullStory/?NewsId=1201438������
    • http://www.farsnews.com/newstext.php?nn=8904061155������
    • http://www.presstv.ir/detail.fa.aspx?id=132487&sectionid=351021501������
    • http://www.presstv.ir/detail.fa.aspx?id=132417&sectionid=351021505������������������������
    • http://www.presstv.ir/detail.fa.aspx?id=132418&sectionid=351021501���������������������������������������������������
    • http://www.presstv.ir/detail.fa.aspx?id=132388&sectionid=351021508������������
    • http://www.presstv.ir/detail.fa.aspx?id=132478&sectionid=351021504������������������
    • http://www.presstv.ir/detail.fa.aspx?id=132427&sectionid=351021507���������������
    • http://www.presstv.ir/detail.fa.aspx?id=132444&sectionid=351021507���������������
    • http://www.irna.ir/View/FullStory/?NewsId=1201590���������������
    • http://www.farsnews.com/newstext.php?nn=8904071534������
    • 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_004_off00002518.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2518 73272 bytes

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