Malicious PDF — malware analysis report

Static analysis result for SHA-256 842dc8b81fe2fced…

MALICIOUS

PDF

36.1 KB Authoring application: pdf-parser
MD5: 01e6e7112d743931d3b9da0a4f11ba10 SHA-1: 20dbcd3f3692cd80b790f424f11fcf4d54c33880 SHA-256: 842dc8b81fe2fcedefc7d95f82463934d5a84abeba49c9f2a4eb6c1f33db99a7
150 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to other PDF files, a technique commonly used for SEO poisoning and phishing lures. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior. ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports the malicious nature. The document body, though heavily obfuscated, contains references to 'Advance wars games for android' and URLs, indicating a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://myzolotce.online/uploads/2020/01/29/1ba923470454.pdf
    • http://eloyjrojas.com/uploads/1/3/0/4/130488754/513da965f44c9a.pdf
    • http://4therestofus.com/uploads/1/3/0/5/130588681/tuzujim_giwukapojuti_luximuzu.pdf
    • http://stokesed508webpage.com/uploads/1/3/0/6/130639653/130639653.html#advance+wars+games+for+android

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000f9b.bin
f8e01187aba7aab50532d538d6a28045d160dccaad3f6ebead0781abd495eb9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B 7504 bytes

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