Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6527d3184445a1…

MALICIOUS

PDF

66.0 KB Created: 2020-11-21 16:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a71e8ee948aacf62aa026be7ff2c1e7 SHA-1: 94ae5e00252d89e203ca3ec79f726f0a64de8480 SHA-256: fb6527d3184445a13822c9c4abc1859c1c6eb700f8c299d1b59c511239d929d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/123?utm_term=words+that+starts+with+s+and+ends+with+r'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://traffmen.ru/123?utm_term=words+that+starts+with+s+and+ends+with+r
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f942e8d5f427.pdf
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5f9ff3baf1bf8.pdf
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5fadcfcb6b207.pdf
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f86f41b1c16a.pdf
    • https://cdn-cms.f-static.net/uploads/4473622/normal_5fa6014c23d3b.pdf
    • https://cdn-cms.f-static.net/uploads/4447271/normal_5f9d9150380c2.pdf
    • https://xigufolasifu.weebly.com/uploads/1/3/4/3/134352497/55c549adf42ecad.pdf
    • https://cdn-cms.f-static.net/uploads/4466151/normal_5fabf7ff51112.pdf
    • https://zikenanevo.weebly.com/uploads/1/3/4/5/134589255/1d0861a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/537b18d4-4f6c-4728-a9a8-d787a4bdebb9/mn_driver_manual_online.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c545.bin
18a0cf0ced009bba7fc93c072ab61bb9ce7ae22d0a9dcb390ffa88ce4a32f47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC545 4988 bytes
font_01_sfnt_off0000d647.bin
73e2d4025b551ea13f988a804dcf50af0674e6ddf85e3977e9437694fda6a2b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 10844 bytes

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