Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b31649a379d91fd…

MALICIOUS

PDF

49.4 KB Created: 2020-11-07 08:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 162912d82db97a1b3a368d4dc1eb5898 SHA-1: 99dae84442434f1dd3f810bad42d09f548e75677 SHA-256: 3b31649a379d91fdb73670db97ec18fdd36ad4e9ec6d9d1ad9ec6bdc14d213b9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URLs, 'https://traffine.ru/aws?keyword=koopa+revenge+2+lambtaco', is flagged as suspicious. The document body, though heavily obfuscated, contains embedded URLs and metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs. The presence of many external links points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://traffine.ru/aws?keyword=koopa+revenge+2+lambtaco PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5fa50c4d0a319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f86f91d1d457.pdfIn PDF document text
    • https://netaxodesu.weebly.com/uploads/1/3/4/3/134367037/990593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/93fcbbed-7eaa-4e3f-b9f9-82bf837dce72/87115431343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b87ec22-3207-4087-9e38-e8aba2b9beaa/46262881968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/191fe313-cf18-4ccb-aa09-6f2fd298f7c3/kizixaleronuvoparejixisu.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/jazataxobuvelabumuniniku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8be69de-2fb0-4f9f-8483-dfda8174429e/jugudujumadiwedalat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04d7877-734a-4542-83c9-30db647a7416/70641496649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb57a7f-beaf-43c8-9140-707423ceb9a2/69990592511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64990b7b-80a1-42bd-8b43-c0e9442f9ee3/pekixokubakid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0c3e73-7a42-4f4e-bbef-47f8494f4d58/sowalomozuvogowux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C0 5116 bytes
SHA-256: e361212c0afc30fff7d7c62f928c665f203e26c65c776e0c0ebbd0aef85c6f90
font_01_sfnt_off00008719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8719 10632 bytes
SHA-256: 968a13da7873cf3c62be81b31326bf5c1d9da9ac15321e5328d11e90089a5c31
font_02_sfnt_off0000ab30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB30 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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