Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3794cc9c490ed74…

MALICIOUS

PDF

66.7 KB Created: 2020-11-26 08:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5a46edef4afbc28a9fa7fcb1c8eae840 SHA-1: 1bf7255dba741a78a3f32ea282e8aa9010733764 SHA-256: e3794cc9c490ed74e4bc37e8d95b577cce31e7b2c6c906164cc5862affd4c61e
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to benign-looking PDFs but are likely part of a link farm designed for SEO manipulation. The primary malicious URL identified is 'https://traffine.ru/strik?utm_term=garry%2527s+mod+free+to+play', which is flagged as a redirector. The document body, though heavily obfuscated, contains references to 'Garry's mod free to play', suggesting a lure to attract users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=garry%2527s+mod+free+to+play In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5fad81fac211c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fbcd2e12f70b.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/64eb3d66f803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5fad769cac89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f8cc523a2c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_5fb4fc75d977d.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/vavale/septum_nose_rings_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/51344364378.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/5040931626.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/did_you_hear_about_math_worksheet_answers_page_188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956a9316-35e5-426b-9952-ad3eb3008acf/82252180424.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/netflix_offline_viewing_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/63522460530.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 5356 bytes
SHA-256: e3b1ed7ab399e3802c879e5611fcef94a2cb00b8c794f3fb5658a20e970a2ccb
font_01_sfnt_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 10124 bytes
SHA-256: d19b1787f8703a242e87759b876ec18f80763a246ffe620b80226d9caedb4ae0

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