Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fbbadc4b7703b3…

MALICIOUS

PDF

43.7 KB Created: 2020-09-19 21:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f12815ca3a121aedb3dd73e8971ee263 SHA-1: 6d1d9175ccce064eccd043d6750d500abd8553b8 SHA-256: 87fbbadc4b7703b3600f362349d2dfa1926aae3e963a4c256be313830e6f1998
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, suggesting the primary purpose is to redirect users to malicious or manipulative content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.club/wix?keyword=tl+vs+g2+cs+go In PDF document text
    • http://files.netherlands-korea.com/uploads/1/3/2/8/132814182/debisuganakupi-gozanugozulex.pdfIn PDF document text
    • http://votivu.australian-spirit.com/uploads/1/3/2/6/132680835/2dfadd8dfe30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4612/6247/files/51045913818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/antagonistas_colinrgicos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/0707/8564/files/dresden_files_rpg_rulebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/vidmate_mod_apk_latest.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/celtx_storyboard.pdfIn PDF document text
    • https://8939502a-04d0-47ab-b7a7-4fba5382dc49.filesusr.com/ugd/011e4b_984843017a02423bbeec7d2679ea2c05.pdf?index=trueIn PDF document text
    • https://60822096-3494-4126-b028-2a681f8afa64.filesusr.com/ugd/21a131_5e5562f3e8a04fadaafbae55c96c1f29.pdf?index=trueIn PDF document text
    • https://b2a687df-f3b3-4d12-8dc2-fb889bf26945.filesusr.com/ugd/8bc2a6_78b50187e2e148e2900d89195e97352e.pdf?index=trueIn PDF document text
    • https://4a095d5a-59d4-4880-a619-62db5fd6e12a.filesusr.com/ugd/cc03df_65c6f588964f4e229f2b029b94d39271.pdf?index=trueIn PDF document text
    • https://42a73387-5d5f-4fd3-8373-4b0af33b9038.filesusr.com/ugd/dcbeda_fc6aa5b901214baca46d6ae6f81fbfc4.pdf?index=trueIn PDF document text
    • https://961d64aa-8af1-441a-945e-6cceefadf66c.filesusr.com/ugd/035627_74d403bf5bb24b9c9cf1ba3a7fc2e7ee.pdf?index=trueIn PDF document text
    • https://37e36504-55fe-4616-8c90-edd0cadb88d8.filesusr.com/ugd/49f5ef_40990ddb23e74e48a249acf3e3fcd9b2.pdf?index=trueIn PDF document text
    • https://1a75232a-e6a9-4a0a-a77f-0a23cac09afe.filesusr.com/ugd/c2007e_49600f254cc944968c4e63820f0e0dc5.pdf?index=trueIn PDF document text
    • https://1d38a0bf-f1ea-43f0-a70b-4b501e75e715.filesusr.com/ugd/12f4eb_4472f1688ae649a9961d6f3db485eacb.pdf?index=trueIn PDF document text
    • https://058a7a77-6db1-4771-a462-92fd207448d1.filesusr.com/ugd/565485_ec135f0cf81c46f7af722dcff6b63370.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D5 4240 bytes
SHA-256: 512262fddf796a9e968c77c6e4d78544ca2aa246174e6ab73d6fb3eeb47a7940
font_01_sfnt_off0000703a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703A 10348 bytes
SHA-256: f90d470ed9abcccb8eb6522a5ae0376c734938eaea6725f12d0444821c29a131
font_02_sfnt_off000093b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34