Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fc6826ff9d1b48…

MALICIOUS

PDF

42.0 KB Created: 2020-09-30 17:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cf019f085f8ad3a650ef27dc277c5a6e SHA-1: 4907417d13a7ed8643c34b2cb345a79b383f241b SHA-256: c4fc6826ff9d1b4833a1024b0fc94dfe66ea4f2f8a57de29fd41e0d445857494
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with a critical heuristic firing indicating that at least one link points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm designed to funnel users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=verbal+ability+pdf+for+gate In PDF document text
    • https://site-1037273.mozfiles.com/files/1037273/lonisamabivinejisepubez.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/20351233776.pdfIn PDF document text
    • https://site-1036807.mozfiles.com/files/1036807/jujegev.pdfIn PDF document text
    • https://site-1036965.mozfiles.com/files/1036965/25277805666.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/penodo.pdfIn PDF document text
    • http://sefov.henleychocolates.co.uk/uploads/1/3/0/7/130738902/giratotutaxo.pdfIn PDF document text
    • http://zexud.badgirls.hu/uploads/1/3/0/9/130969336/258380.pdfIn PDF document text
    • http://files.marinaredlich.com/uploads/1/3/0/9/130969598/fc2135835.pdfIn PDF document text
    • http://zususezow.lbksupersr.com/uploads/1/3/1/4/131407406/0219f763c41.pdfIn PDF document text
    • https://site-1037028.mozfiles.com/files/1037028/favugupirisubos.pdfIn PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/91279043952.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/21535077291.pdfIn PDF document text
    • https://site-1036907.mozfiles.com/files/1036907/79189159525.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/govituzokuve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/8517/5453/files/basha_songs_masstamilan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1116/5336/files/xivizavoxomuvivivin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/fokovowuzusolobuxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3201/9097/files/date_sheet_of_10th_class_2020.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 8

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_off000066a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A3 5236 bytes
SHA-256: 696e8958dce6db202cbbb6489db640add0506796180c7a27e5ec19f41001c05a
font_01_sfnt_off0000788f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x788F 10124 bytes
SHA-256: 2f386e26567589d3e7c67d0690153c47c5ce357ff08692199c31658cd39c7257

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