Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a0bc88bc17ef3f…

MALICIOUS

PDF

41.8 KB Created: 2020-11-09 16:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4040987a4626ecd3ed8f36e17f80264f SHA-1: 1d9889841daddd9ed3d31e46a450aa38846ec7cc SHA-256: b7a0bc88bc17ef3f1574d751dca1c83a0b3d6d278200b7514bf08831ee584c8b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://traffnew.ru/123?keyword=five+nights+at+freddy+s+anime+game+download', appears to be a lure for game-related downloads. While no scripts were explicitly extracted, the PDF structure and extensive link farm are strong indicators of malicious intent, likely to facilitate further compromise.

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://traffnew.ru/123?keyword=five+nights+at+freddy+s+anime+game+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f9882dc86425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f90d8dac39a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f95589584d89.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/nixezuwime.pdfIn PDF document text
    • https://xutomanuvafara.weebly.com/uploads/1/3/4/3/134345830/05904c.pdfIn PDF document text
    • https://dududisekit.weebly.com/uploads/1/3/4/3/134348084/1106613.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/wesudemapemifagu.pdfIn PDF document text
    • https://gajitiromivalot.weebly.com/uploads/1/3/4/4/134475956/6e4ab3d5f5.pdfIn PDF document text
    • https://pekireraseg.weebly.com/uploads/1/3/4/7/134720831/4445178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f9438470f4d7.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/pajaji_tumovupevojene.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/faboxu_benij_nudime.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/1ef64772-75fe-4d03-b974-20fd34835acf/46835990194.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_off00006505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6505 5532 bytes
SHA-256: d704defc14921a812e67ebd97da3df38fd8d64dd1d3a92a3325ebc49a06ea33f
font_01_sfnt_off000077ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CE 10192 bytes
SHA-256: 777188663dbcb753fcda634b080a41eab302ab2873f1d4b63dc6e7423a507a3d

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