Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac56e0bdf531e502…

MALICIOUS

PDF

34.9 KB Created: 2020-11-08 02:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c3083cb42e6c244ab68471de9eeafa8 SHA-1: 93e3ef0be089c57488b203fe7d15b6efa57ff92c SHA-256: ac56e0bdf531e502c91b6dd09b8e8185f2876703f27edd6a88035832dc69be11
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as academic or technical documents, indicating a link farm or SEO spam campaign. The primary malicious URL identified is https://trafffe.ru/aws?keyword=springboard+geometry+textbook+pdf. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to drive traffic to these external resources, potentially for malicious purposes.

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://trafffe.ru/aws?keyword=springboard+geometry+textbook+pdf
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5f9b72a0090b0.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f8a86425f0be.pdf
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5f989de9aeedc.pdf
    • https://roundrocktx
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bubakujane.files.wordpress.com/2020/11/60030812079.pdf
    • https://mipibona.files.wordpress.com/2020/11/wuperuxopanozotad.pdf
    • https://uploads.strikinglycdn.com/files/c1f2f1a4-db15-45fe-9dbd-669dbeb84283/work_power_and_energy_worksheet_answer.pdf
    • https://uploads.strikinglycdn.com/files/17cacb78-12c5-4f18-9eb9-b2bfcad4587f/injustice_2_gear_system.pdf
    • https://uploads.strikinglycdn.com/files/66d76ba3-0932-4e4b-9fed-b18014dda8a1/64494357945.pdf
    • https://wixipozi.files.wordpress.com/2020/11/psycho_pass_akane.pdf
    • https://s3.amazonaws.com/zupenafud/deik_robot_vacuum_manual_in_english.pdf
    • https://uploads.strikinglycdn.com/files/a6258701-5b51-4cfc-9dc0-733a39cffaf5/vobibedodivapazaf.pdf
    • https://uploads.strikinglycdn.com/files/2bf60967-3a5b-4dac-8f28-f20f1c64ad0c/febepazozunep.pdf
    • https://tilidefixof.files.wordpress.com/2020/11/data_analytics_made_accessible_2018.pdf
    • https://poxojij.files.wordpress.com/2020/11/download_beautiful_creatures_in_hind.pdf
    • https://s3.amazonaws.com/pibabopuduj/class_vice_president_speech_ideas.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_off00004888.bin
a99a526ed98b8f94bf926b8c77a3c5bcf5c636abf06c1250c7033f54a44b798b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4888 5628 bytes
font_01_sfnt_off00005bad.bin
4cdb327caea5103130dd1d9bca9813fa9f9fa39575cd2868aad5afbe94d146de
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAD 10296 bytes