Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a4f5f31c385548…

MALICIOUS

PDF

69.6 KB Created: 2020-12-26 19:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09934d75d09dc4a99a006cacb7397323 SHA-1: 1a7fd47d14d3cb14f6f251135106a0a48d2da5fe SHA-256: 31a4f5f31c3855482f84e1200d883861177582bc0b02a00316c24b6c3cfbc90a
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, with one prominent example being https://trafftec.ru/strik?utm_term=dodgers+la+times+special+edition. While no scripts were directly extracted, the presence of numerous external URLs and the ML classification strongly suggest malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=dodgers+la+times+special+edition
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f8b5b7dcbf5d.pdf
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/0bbb36b28848.pdf
    • https://cdn-cms.f-static.net/uploads/4451035/normal_5fbc95e5f419c.pdf
    • https://cdn.sqhk.co/gibuzini/CEheC1o/wasserbahn_waterpark_iowa_city.pdf
    • https://cdn.sqhk.co/xotalawad/33gjO3G/zakurezidarigoxifagi.pdf
    • https://cdn-cms.f-static.net/uploads/4463785/normal_5fe6196a8f87c.pdf
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/3867629.pdf
    • https://static.s123-cdn-static.com/uploads/4374986/normal_5fe2d6679e156.pdf
    • https://luxapojago.weebly.com/uploads/1/3/4/3/134327771/lujokogefaxafup_zikuwago_jawaz_zobifimonurused.pdf
    • https://lisokafi.weebly.com/uploads/1/3/4/6/134694643/60573d55b33f.pdf
    • https://cdn-cms.f-static.net/uploads/4403952/normal_5f9f615a3a50a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1466a3c5-255a-494d-93b8-642c66df80bf/entrepreneurship_phd_programs.pdf
    • https://uploads.strikinglycdn.com/files/efc3e149-0be4-4553-9f2f-b1671c9987a7/psy_2012_ucf_reddit.pdf
    • https://s3.amazonaws.com/napejaxosinages/akreditasi_puskesmas_bab_9.pdf
    • https://s3.amazonaws.com/puretulenuza/batman_arkham_knight_family_matters_trophy_guide.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_off0000d424.bin
7002539ea637071b6b02de94a6e2bc021c5bfceceff879fcc83da6917ca4f3c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 5392 bytes
font_01_sfnt_off0000e668.bin
dd12d95627e6798a6faee8d32a58c04bc716ea87d41dc776255345e28685bfcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 10296 bytes