Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4fb7bddfda124a…

MALICIOUS

PDF

47.8 KB Authoring application: QPDF
MD5: 3242c0a1276195803fcfa498eb088fe0 SHA-1: 01e2455724a2c15910dc18447f27813dd58a7a15 SHA-256: 8b4fb7bddfda124a7bb07f8ef32d891da47b5067b7c11ea4e7a43779c9dc81e5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to external PDF documents hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly suggest malicious intent. The embedded URLs are the primary indicators of compromise.

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://beyoncebus.com/uploads/1/3/0/5/130541745/lusosaxa.pdf
    • http://6monthsatatime.org/uploads/1/3/0/5/130541641/3788078.pdf
    • http://brownfencing.com/uploads/1/3/0/3/130379292/ropazo-nobaberer-xuribidaxetisi-kavunesaba.pdf
    • http://aweddingphotographer.co.za/uploads/1/3/0/4/130478481/8061452.pdf
    • http://artsandhovercrafts.com/uploads/1/3/0/5/130540193/jarosifuga_jogojero.pdf
    • http://armidalebushwalkers.org/uploads/1/3/0/7/130738719/9691391.pdf
    • http://theswcc.org/uploads/1/3/0/3/130313005/pelidizose_gukeninudekegi.pdf
    • http://hello-baby-toys.com/uploads/1/3/0/6/130604681/130604681.html#3d+video+wizard+manual

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010f9.bin
dd1a12652849f18922a8fc33ee0ebe7e9431943a6689aac98f3834910487f3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9 7384 bytes

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