Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a687acb4c4ea25…

MALICIOUS

PDF

40.7 KB Authoring application: QPDF
MD5: fa3b59bdbafe87617646d0c88424f5e0 SHA-1: f841f07fed8bd84be899877f0c7c54ed23780b96 SHA-256: b6a687acb4c4ea252538062ff43c653f0afd6f413ae67cc54a02f0d2d3fe7443
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output further indicate malicious intent. The embedded URLs likely serve to redirect users to malicious sites or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mjjam.net/uploads/1/3/0/4/130490602/fidako_kobixakolir_dulevamar.pdf
    • http://mosaicinaction.com/uploads/1/3/0/6/130639508/sexisoluzoragezu.pdf
    • http://johnhancockcenterchicago.com/uploads/1/3/0/5/130588295/lapabidop_pirosexulujofu.pdf
    • http://bshk.hklss.hk/uploads/1/3/0/3/130324030/vawirilipurip-fikazum.pdf
    • http://misssoutheastpageantry.us/uploads/1/3/0/2/130272442/130272442.html#acromioclavicular+joint+separation+radiograph

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010aa.bin
d0a42f037c32de02e26e9057c9083c3b72c051041a246797c2004ac71b9b4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA 8356 bytes

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