Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e885f46f0bfd7c…

MALICIOUS

PDF

45.3 KB Created: 2020-11-06 01:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea092125a6528682e5aef63b02390a94 SHA-1: 1bf16cf640e95f5fc5d15a604dc242612325df33 SHA-256: d7e885f46f0bfd7c2dcf1f605799d031d4d39fc1de29da11c4511ffa0885adf6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a primary focus on SEO spam, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The embedded URL 'https://trafficel.ru/123?keyword=four+against+darkness+pdf+free' is likely malicious and serves as the primary lure. While no scripts were explicitly extracted, the ML classifier flagged this PDF as malicious, suggesting it may contain obfuscated JavaScript or other malicious content designed to exploit PDF vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?keyword=four+against+darkness+pdf+free
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f89fec3c1cab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/davubewu/dcuo_leveling_guide_2018.pdf
    • https://uploads.strikinglycdn.com/files/fe2574f2-7ee4-442c-8f26-ddb729b24917/artwork_proposal_template.pdf
    • https://uploads.strikinglycdn.com/files/cefcee1a-9cc7-4818-b6ba-c981dcb29c06/72364338501.pdf
    • https://s3.amazonaws.com/wokesabisevo/frisby_speakers_manual.pdf
    • https://s3.amazonaws.com/wofaxil/folexurikisibagirenuwoz.pdf
    • https://uploads.strikinglycdn.com/files/0cad66f2-b7d8-40e7-ab8f-096ede645a9a/black_ops_3_zetsubou_no_shima_plant_guide.pdf
    • https://uploads.strikinglycdn.com/files/64ded39d-0c86-41e2-ae7b-537e721d9098/57295950733.pdf
    • https://cdn.shopify.com/s/files/1/0432/6798/1476/files/yaesu_ft_5100_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/84ff1cb3-aa37-4b89-ab4e-51c8514cddce/baboj.pdf
    • https://uploads.strikinglycdn.com/files/7001444b-fc40-46f1-9e01-ee6e01638de1/bidevigebo.pdf
    • https://s3.amazonaws.com/fuwawibu/beekeeping_equipment.pdf
    • https://uploads.strikinglycdn.com/files/0467fb71-c989-4cad-8ca2-83a262da50a6/5327385293.pdf
    • https://uploads.strikinglycdn.com/files/b74e6b47-e999-465a-9f07-10760c535635/zigosiwemetitikizo.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_off000072a6.bin
dc00504d82b1740fb84ee1500e742d38e78d4c3b6e71a2f52d8ba280f08b9b3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A6 5196 bytes
font_01_sfnt_off00008469.bin
842174df0068397fa3a1455159f1bbad8037f42754a2476f1c92cca830c5494e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8469 10684 bytes