Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f13c8d4ee8db53…

MALICIOUS

PDF

39.7 KB Authoring application: Adobe PDF Library 9.0
MD5: 088b9a6a1731f2d15d066c20516fdb0e SHA-1: 01e540adfdf55eee6c36201ba07152e474f88bfd SHA-256: c3f13c8d4ee8db53da56c12064a15ee37920a021b13453348a4933bbe9c4322c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The document body, though truncated, contains references to external URLs, reinforcing the link farm behavior. The primary attack pattern involves redirecting users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://firedupaboutfitness.com/uploads/1/3/0/6/130621853/5185376.pdf
    • http://rax.damvdolg.su/uploads/2020/01/28/kuwelab.pdf
    • http://doddjohnson.com/uploads/1/3/0/2/130273812/mopexifomak.pdf
    • http://nlightnstudio.com/uploads/1/3/0/3/130323593/wimaxinugofegekoweka.pdf
    • http://nastynotfound.com/uploads/1/3/0/3/130324351/kiviko_fizixekew_wuvuruwi_sodasokifedawu.pdf
    • http://benkregel.com/uploads/1/3/0/6/130604692/130604692.html#thanos+wins+cosmic+ghost+rider

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010c6.bin
9c4eaa8cf1f453cabf31c40dea0d9733ab610aa67e3faa20345cf103e5763d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6 8236 bytes
font_01_sfnt_off0000606b.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606B 2652 bytes

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