Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd63244f5d243c2…

MALICIOUS

PDF

43.2 KB Created: 2020-11-08 13:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3adfdf5e6f3fdfdf5ce13754e7ae0fb0 SHA-1: c747ec9133d4bf6095a4b72c67de8b58756b51ad SHA-256: 7bd63244f5d243c2cc11d88f13717221624745af8a76b02e1ad00732e8d742ea
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary focus on directing users to 'traffnew.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports malicious intent. The document body, though heavily obfuscated, contains the suspicious URL.

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://traffnew.ru/aws?keyword=plant+hormones+pogil+answer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fa0bd53b99b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f88b6fd1ba2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5f9efdd49cd2c.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/3fe53313-5c50-4cf2-adb1-25d5f5bc557c/mukigijoxoxulunopatoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9751f8f8-8c03-4e53-a38a-c05f1102615b/xupuzowejefosos.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/ffxiv_anima_weapons_quest.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/whirligig_chapter_8_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3064831-a113-4656-918d-75eb6da953c9/46105443459.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/dairy_free_keto_meal_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/ishimaru_kiyotaka_fanfiction.pdfIn PDF document text
    • https://wopuxipimupa.files.wordpress.com/2020/11/wotilimokojonuriku.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/34965258058.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/dream_phone_game_90s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e12fbfb-b8fa-40bc-85b5-aa2d4cc879bf/81001421082.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_off000069a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A6 5324 bytes
SHA-256: 106a0f2866993874fb28ebbbd5b1823c9969424999381142afe56851cea4f70e
font_01_sfnt_off00007bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAB 10648 bytes
SHA-256: e0d115bd0569c2e4062c7f8728c69dd26f7ed93b4c2edce4bb0e81f99ef146bd

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