Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1f27079670215c…

MALICIOUS

PDF

41.1 KB Created: 2020-10-04 03:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb654a2d395a6b574a8bdd33a8bb869f SHA-1: d13e58dc59429e3be9a77dd448da37c53e6586f7 SHA-256: 4b1f27079670215c2fbe11690481f11fe9cbe787bb3bfeb8ad9f2a38c647fea1
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that point to disposable hosting, suggesting a link farm designed to funnel users to malicious sites. The ML classifier strongly indicates malicious intent, likely to lead users to a phishing or malware download page.

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://cctraff.ru/strik?keyword=biodiversit%25C3%25A9+en+alg%25C3%25A9rie+pdf In PDF document text
    • http://napaluje.sieglindemcgee.com/uploads/1/3/1/4/131407836/teteworazebinu.pdfIn PDF document text
    • http://biwuje.myspecialeventcy.com/uploads/1/3/1/4/131437181/pabewelusikedob.pdfIn PDF document text
    • http://gojide.malenyartscouncil.com/uploads/1/3/1/4/131453046/jumubalapu.pdfIn PDF document text
    • https://site-1039907.mozfiles.com/files/1039907/4702603103.pdfIn PDF document text
    • https://site-1037850.mozfiles.com/files/1037850/rabokajabaxapiwidesuli.pdfIn PDF document text
    • http://werapovo.ericthecreative.com/uploads/1/3/0/7/130739206/7739200.pdfIn PDF document text
    • http://files.pmawm.com/uploads/1/3/0/7/130738933/lesutubivutuwi_tekivegirole_gagujapodunen.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/1/0427/8291/6767/files/waking_nightmare_skyrim_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6713/8460/files/skyrim_character_builds_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5491/5488/files/60906478394.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_off00005d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D76 5460 bytes
SHA-256: 0e216c8021ed4132add84d44a529e8e4ec57e74df036f8bdddb6359a5f8b2370
font_01_sfnt_off00006fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE2 11992 bytes
SHA-256: c2cdb5583ecda88ea3bdb056cbd7cbe6ce032ebedcec4d7412f427b9dade5f79

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