Malicious PDF — malware analysis report

Static analysis result for SHA-256 880c89b94e45e42e…

MALICIOUS

PDF

34.9 KB Created: 2020-09-30 13:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 97402804ebae0a2f762acc56266e953d SHA-1: ccb527db77a485744799d2627d95fbc896b1216a SHA-256: 880c89b94e45e42eebff69bd9883c83b939f387cb77b68fece175fbf6f50d7b3
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to lure users to malicious sites. The primary malicious URL identified is https://cctraff.ru/strik?keyword=materiales+compuestos+derek+hull+pdf+descargar, which is flagged as a known malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the embedded links are the primary threat vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=materiales+compuestos+derek+hull+pdf+descargar In PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/feponejokokonuxorugupu.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/lazepijinawevopod.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/72687229762.pdfIn PDF document text
    • https://site-1037881.mozfiles.com/files/1037881/94993414267.pdfIn PDF document text
    • https://site-1036936.mozfiles.com/files/1036936/simopesimaruluvepepibaxe.pdfIn PDF document text
    • http://toxigik.tasstudentlegalservice.com/uploads/1/3/1/4/131453336/bonokofurujir-jeninewufokuj.pdfIn PDF document text
    • http://files.lakeeffectclarinetquartet.com/uploads/1/3/1/1/131164473/supovipuk.pdfIn PDF document text
    • http://files.catheymccrary.com/uploads/1/3/1/8/131857213/6490069.pdfIn PDF document text
    • http://files.usatoyfactoryaustin.com/uploads/1/3/1/6/131637021/xemurunopivudadukix.pdfIn PDF document text
    • http://pinezedut.grindstonelakebiblecamp.org/uploads/1/3/1/4/131483083/1079785.pdfIn PDF document text
    • http://zipejisuk.richmondbulldogs.org/uploads/1/3/1/4/131438110/d5edfa380.pdfIn PDF document text
    • http://guzavafe.country-fitness.com/uploads/1/3/1/8/131856214/1921007.pdfIn PDF document text
    • http://files.highwaycitycd.com/uploads/1/3/1/4/131482954/vafumesuri.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/1/0429/3830/2630/files/4363009386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0118/3388/files/what_is_resistor_capacitor_and_inductor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9646/0443/files/naketusogiwemenatovuzim.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_off00004627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4627 5640 bytes
SHA-256: b7f72308f4b75733982a4be9524aabd069fcc021d94761c1aa0c2a98aac4f5e2
font_01_sfnt_off00005938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5938 10940 bytes
SHA-256: 84221f51d41d233a6da27f75bc4b99acd7377cad3180b5040f93d33f333a6d8e

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