Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caccf58a3abe6bf…

MALICIOUS

PDF

41.2 KB Created: 2020-10-08 08:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 65a841e14595c45616cb9dd6d66a517f SHA-1: 60bb8484d1b372f206feb7f7084f1b2cef844def SHA-256: 6caccf58a3abe6bf6592165566f0e01b0a5028fa3bf6cea8cab7b8fa85a40130
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to known malicious redirector infrastructure at `https://cctraff.ru/strik?keyword=food+chain+vs+food+web+edhelper+answers`. The document body, though heavily obfuscated, appears to contain similar URLs and text related to educational content, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=food+chain+vs+food+web+edhelper+answers In PDF document text
    • http://tudivezu.niguelarevalo.com/uploads/1/3/0/7/130739046/5045319.pdfIn PDF document text
    • http://files.withinyourmeansdesign.com/uploads/1/3/1/8/131871902/voririxub-sibowixa.pdfIn PDF document text
    • http://jixol.brittanygiametta.com/uploads/1/3/1/3/131381886/jupunokalewokogev.pdfIn PDF document text
    • http://files.bassmru.com/uploads/1/3/0/9/130969439/deforexezetig_musiranuw.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/61530482943.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/jokirozejonukew.pdfIn PDF document text
    • https://site-1037156.mozfiles.com/files/1037156/verofokatogoludir.pdfIn PDF document text
    • https://site-1039303.mozfiles.com/files/1039303/ximimuvemonanesofoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1356/9690/files/mp_9mm_magazine_well.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/juketajizuponaxiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1591/4151/files/41436655735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5601/2191/files/13377600307.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0160/0411/files/coleman_455_hot_tub_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92485c9-7d33-4816-9ac3-5b5c1e8c2f6f/97417727851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075437c3-9990-4a1e-8af8-11d5a0b4ae45/5626487168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49204856-d84d-4cf6-8ee7-7f2a39f99657/bizebunapagosinejafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce5cfc1-a582-4e1c-98a8-3715ac5e4144/godidukavo.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_off00006081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6081 5492 bytes
SHA-256: 03ed041716647661cb7dc671488c886d9364b025078bb8b8ce9c8f9555e6b1a4
font_01_sfnt_off0000733d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733D 10828 bytes
SHA-256: dae0ba5fc2ca0a9c7b5dae576d701779b742163fc96a338c9327f4c9549be9ef

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