Malicious PDF — malware analysis report

Static analysis result for SHA-256 540fe3f2c0a3114e…

MALICIOUS

PDF

45.6 KB Authoring application: PDF Studio
MD5: 99c0869ad758af964c99ae84f9186582 SHA-1: e321cfc42b9ea1dcb1426fa124eba4c1c6f28afa SHA-256: 540fe3f2c0a3114e6f98cf099f0be47ffb5bbfd93e1c874e371bcf10e97dc6b2
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external websites, a technique commonly used for SEO poisoning and phishing lures. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The document body, though heavily obfuscated, contains URLs that are also present in the embedded link farm, suggesting a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://reshenie-lyubercy.ru/uploads/2020/01/28/dibetoku.pdf
    • http://sryoga.co.uk/uploads/1/3/0/4/130435922/dipatone-kobufufa-nibipojizufad-zevefede.pdf
    • http://bridgewist.com/uploads/1/3/0/2/130272364/0b77a7c203351c.pdf
    • http://nuobeijinghotel-chinese.devsite-1.com/uploads/1/3/0/4/130483447/130483447.html#nutrition+information+for+green+giant+riced+cauliflower

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001096.bin
5c4542a083a79da672fd33c0128c026f1ca3ea4978906d7b8df54c2ed101e74f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096 9496 bytes
font_01_sfnt_off000063a3.bin
16b75f15ac8a4d2d76652185fd02e48247565669d9545631ef2276cac75ea542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A3 13416 bytes

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