Malicious PDF — malware analysis report

Static analysis result for SHA-256 e637c7b9b266f886…

MALICIOUS

PDF

46.4 KB Authoring application: Pdftk
MD5: 021e8b3192ead7e1f0d4ee2dfdeaabe5 SHA-1: 5977cab99fd0a20f0b1d1ea22cd1b73671bc521c SHA-256: e637c7b9b266f88605b7772f2861eb87a0752c9c2569fbac0bb98464c6050647
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 and the ML classifier output further support its malicious nature. The embedded URLs likely lead to phishing or malware distribution sites, aiming to trick users into downloading further payloads or submitting sensitive information.

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://ants-life.ru/uploads/2020/01/29/vuzujeku-lupawab-tapotamilam-fizijufebel.pdf
    • http://metropolismexican-grill.com/uploads/1/3/0/2/130287852/8437.pdf
    • http://myinklady.com/uploads/1/3/0/3/130323594/22c18c.pdf
    • http://nutritiongirl.org/uploads/1/3/0/4/130491703/2849443.pdf
    • http://theelfbox.com/uploads/1/3/0/5/130589187/130589187.html#b1+english+grammar+exercises

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001194.bin
0889e2a97def4448cd6321ae33d6dc2e1eec7aa34ee8d1334199274f314fe2ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194 7736 bytes
font_01_sfnt_off00006dcd.bin
fee8d81852334122717895109c2059c260d17b6cbcf32fdac71b28e55c2762cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCD 16508 bytes

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