Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff6ddba1486b1b3…

MALICIOUS

PDF

67.9 KB Created: 2020-11-18 18:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3fb5e46312ffe6dbd447384985d5aa72 SHA-1: 3b2f8b421f5cc52d9437fecb74d9b7ec526fece4 SHA-256: cff6ddba1486b1b37273512ea8adde9d8deadf6973b5615d060051295bc0d6af
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to drive traffic. The primary external URL observed is 'https://trafficel.ru/123?utm_term=civ+4+mods+download', suggesting a lure related to game modifications. While no scripts were directly extracted, the PDF structure and extensive link farm heuristics strongly suggest malicious intent for traffic redirection or potentially hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=civ+4+mods+download PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/ruxef_nugamuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5f9f80f895a9e.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/xoramisosu-pixepif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f944154c56bd.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/1969782.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/xoroxinogat-pomona-mibivotudosutom-wabukazige.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/lavejazato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec707b86-86c9-4251-98dc-0ed0d99dfc62/nebuzikuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988a4e51-1e3f-4077-ac4d-f176278878d2/20564160792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05956621-b16b-4bbd-939b-2efe4dd8edd4/12627521566.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/game_playerunknown_s_battleground_offline.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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 5020 bytes
SHA-256: 6889e133e2e4a406c51f77343c055cf4085350ac4b4cba5aba087210820fa373
font_01_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 10184 bytes
SHA-256: c0e0989b36381b8b10192c0f7c7d816d77af70881e89b2d66d20ef662f4b05ba

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