Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae31ffc120930e7d…

MALICIOUS

PDF

41.5 KB Created: 2020-11-03 11:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1d19deaec6cfe0d1dee3339ee3ea7f5b SHA-1: 1cfc7804ff8a1604a255752c16e76762af8c6371 SHA-256: ae31ffc120930e7dde65b3067214d42af5c77d89331f5f0cb7a37e892bd985b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a sports schedule. The presence of numerous external PDF links, many hosted on S3 buckets, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/aws?keyword=west+springfield+high+school+sports+schedule In PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/b4a5f296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f9bc58671560.pdfIn PDF document text
    • https://tenasusuboziwid.weebly.com/uploads/1/3/4/3/134349012/c20f3d000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5f8fcb6635fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f98a0227af6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f874fac4f409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/b_braun_dialysis_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/puppy_worming_schedule_milbemax.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/present_continuous_tense_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ruletetunima/83527680463.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/wufizuke.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/reservoir_induced_seismicity.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/15546368273.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/possible_questions_and_answers_for_job_interview.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_off00006397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6397 5220 bytes
SHA-256: edc6b6d8016ed603088b286bee7426e26f4889c48e88a2fc2f64994b3ded53ab
font_01_sfnt_off00007569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7569 10532 bytes
SHA-256: b15456d35e89c472abd654e9be5bd4e28c15eb6739f1ef9c7b8454405ce871d2

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