Malicious PDF — malware analysis report

Static analysis result for SHA-256 0484ba2bf9ff134c…

MALICIOUS

PDF

69.0 KB Created: 2020-11-06 16:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2f549e15a19a8db4b8574edd0ba5e385 SHA-1: d7c4a791982f6249417579249bf39c56df01b457 SHA-256: 0484ba2bf9ff134cee74677d75a398d30a70c04806b939e783a14bf72f524e10
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?keyword=ffxiv+alphascape+3.0+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8b5c4ce60dc.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/b98b3.pdfIn PDF document text
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/duwirelegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f8f3411e4af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f8aaab94de72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_5f9857a71e631.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ribowazakas.files.wordpress.com/2020/11/97689997320.pdfIn PDF document text
    • https://mufepokupi.files.wordpress.com/2020/11/purunagegutawesogirifug.pdfIn PDF document text
    • https://rarokazuj.files.wordpress.com/2020/11/13838944884.pdfIn PDF document text
    • https://tobaluli.files.wordpress.com/2020/11/67241933335.pdfIn PDF document text
    • https://devirum.files.wordpress.com/2020/11/kyoto_tourist_map_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33165d3f-5bec-4c15-a88f-148fcade3778/jojamod.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABA9 5744 bytes
SHA-256: c0d755f69b935c94cf341a2a268cadb13a72f4f6dd6414ab08ced0d9ecfb7c76
font_01_sfnt_off0000bf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF41 2932 bytes
SHA-256: 7c06536ddc40e81be51f90e78fe63b54cf1c7b6468e7d21f5d34bd9410830430
font_02_sfnt_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 10896 bytes
SHA-256: b65f87ea05a60742ee8d6c0854cfeebde41c786c767d7f0c3c8a71756d14808a
font_03_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 16220 bytes
SHA-256: c17d8be9755ddced0d0a87a3d5765a1e2e44190ed6c433e04351ec264590a2e6

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