Malicious PDF — malware analysis report

Static analysis result for SHA-256 9520e4582a110de9…

MALICIOUS

PDF

46.0 KB Created: 2020-11-08 22:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ee489de48d0d105b7080dbcb0a0b1535 SHA-1: bdf1f7c545ed02a86e51110c82d2938d0ec511b9 SHA-256: 9520e4582a110de9f0df973ee1da4f176f0ece30ca4152a3ecd616d9565f68c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafffi.ru/123?keyword=classic+wow+ret+paladin+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f90956b97b1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5f94684fa80fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5f9e0e5c86e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_5fa54bfd5d250.pdfIn PDF document text
    • https://wowumasoz.weebly.com/uploads/1/3/4/3/134310839/notimamusaxer-wunebu-fugunevuxafedav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f8c5498e368d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_5fa2e9e6e56d7.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/barig_kibukokibaza_satisu_nedisodak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388282/normal_5f98ec5eb6da7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f891c31e8d0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tugulix.files.wordpress.com/2020/11/so_too_either_neither_exercises_with_answers.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/riroxilu.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/inflected_endings_words_their_way.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://meniluw.files.wordpress.com/2020/11/72888701979.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_off00007467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7467 5240 bytes
SHA-256: 2c28df28aec47ad029c6a42c3933cad25f3df22385ae4510ae8c4a6553ebee77
font_01_sfnt_off00008650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8650 10712 bytes
SHA-256: 4a2b0c40ce26c61c51f390b665cad2697d72c08bfd5a8c78e3f54948114193e6

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