Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3a5559e31c1df4…

MALICIOUS

PDF

39.4 KB Authoring application: SWFTools
MD5: 6c72286f880b2a220cd58db3b192f595 SHA-1: 23b36036a96dae272b8581caa35164eb3d01cf75 SHA-256: 8a3a5559e31c1df41fa3bc7b9ec46305577ca61f5ae23f71e19fbb3f35b1982b
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF and HTML files hosted on different domains, suggesting a link farm or redirection mechanism. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports a phishing or malicious redirection intent. The document body, though heavily obfuscated, contains references to 'math worksheet printable free 3rd grade' which may be a lure to disguise the malicious nature of the links.

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://greenterior-design.com/uploads/1/3/0/7/130775831/bipumufoduneleb_nonofupoze_gexaxexe_wexazak.pdf
    • http://barcorealtyofaquia.com/uploads/1/3/0/6/130603704/wokedafamux-defoj-jagerizadi.pdf
    • http://imranyusuff.net/uploads/1/3/0/3/130379431/zuzezejezan.pdf
    • http://surveyoz.com/uploads/1/3/0/8/130814241/zixebeduduwazukusi.pdf
    • http://stavrias.com/uploads/1/3/0/6/130621677/160658.pdf
    • http://sweetestdreams.org/uploads/1/3/0/6/130620343/130620343.html#math+worksheet+printable+free+3rd+grade

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010de.bin
f23e2c90f903b83a0e70b4c67ffdd255532bc0ed469182d04100ec6d9c599073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE 8488 bytes
font_01_sfnt_off00005f1a.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1A 2652 bytes

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