Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2384a0af0531528…

MALICIOUS

PDF

41.8 KB Created: 2020-11-01 02:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ce95b033604ea9bda4debf93ea629f2 SHA-1: d7c74c64a51fb2c139b3e38e251b93e909359bdb SHA-256: b2384a0af05315282926e1abdbc386d7a8a9609ee737092373a9904c5666dc95
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as well as a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the URL that triggered the malicious redirector heuristic, indicating a likely phishing or malware distribution lure.

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 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://ttraff.club/123?keyword=roland+grise+middle+school+supply+list
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f915f01af89f.pdf
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5f8ef34e641d2.pdf
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/3590787.pdf
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f89a790e4bc8.pdf
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/lilitifaxifasesijex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nonabafat/apa_style_quick_guide.pdf
    • https://uploads.strikinglycdn.com/files/5225e9a2-8575-4623-9854-851828ef1733/rikesulivukeremov.pdf
    • https://uploads.strikinglycdn.com/files/516947d8-399f-4298-ab66-5d1fa45ebc13/science_and_development_of_muscle_hypertrophy.pdf
    • https://cdn.shopify.com/s/files/1/0502/3734/1896/files/16945761620.pdf
    • https://cdn.shopify.com/s/files/1/0484/2831/8877/files/computherm_q3_rf_manual_de_utilizare.pdf
    • https://uploads.strikinglycdn.com/files/0ba46aed-f07e-499c-afba-399aed0d01d6/books_on_marketing_strategy.pdf
    • https://uploads.strikinglycdn.com/files/66fda454-c709-4d54-afc4-f282e47090f0/82803965077.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e8.bin
2ca73b6122639fa1cae51831b4dac1a7f1657abfb4fffbf445e14629ed10a4f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x63E8 5596 bytes
font_01_sfnt_off000076d3.bin
94c9c9cafbaf86dd06f38f10122ed6fd2268b02f41fd2d91ab39f5b4ee8a2604
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D3 10496 bytes