Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fcac117a95f920…

MALICIOUS

PDF

77.8 KB Created: 2020-12-29 13:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ded7198d89ffb037f4a553ed64d6b08b SHA-1: 91d9cc18166858415f6623453df98c2628d44b18 SHA-256: 25fcac117a95f920cf69dc99eb162f9edc41ef408c91a94988235411391c1176
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 'traffmen.ru'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links to external PDF files, likely intended to manipulate search engine rankings or redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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=farmville+2+country+escape+cheats+2018 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5fcbf0ec563e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5f9c9c5531395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411918/normal_5fd0798bd243d.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/gunuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417422/normal_5feb0d06b9701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5fdea409becb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fd66400dedbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fadfc67efcbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fc6f649ddabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f964b0434363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/gout_treatment_australia_guidelines.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 5812 bytes
SHA-256: 0bfe83f2eed90cdfe01e0fcd5c50c15a98fbd313bc9b637c5a706fa43d846b1b
font_01_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 11500 bytes
SHA-256: a690e22fcd0eb65db7499103efdba6bc2ba929a9b082dc35d072049f94cd9e65

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