Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4f8b204d3f4ba8…

MALICIOUS

PDF

61.6 KB Created: 2020-11-01 07:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a0ffa5d9111c86fc0935d9445f642da4 SHA-1: de743abd3cb43b1b1a090a1b7ce5b05b0dab5320 SHA-256: dd4f8b204d3f4ba87443bb732829a3ec312fccdeadb0dd63f06ef2a200c2780d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a larger network designed to artificially inflate search rankings and distribute malicious links. The embedded URL 'https://cctraff.ru/123?keyword=what+caused+the+decline+of+ghana' is the primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?keyword=what+caused+the+decline+of+ghana In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f8fb62f152d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f870128bedd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/12416322007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0731/7410/files/employee_self_evaluation_sample_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/3442051650.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/aqeedah_tahawiyyah_hamza_yusuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/392a8190-2483-4d5b-9682-66031683e36f/caderno_de_teses_do_pt_boato.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/larujuvitimadukita.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/maddie_poppe_and_caleb_lee_hutchinson_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f7e246-ae5c-42b5-9067-aa4b274b15ec/stephen_f._hayes.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/como_auscultar_los_pulmones.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/dakorivotalopiromutew.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/15579311789.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_off0000afaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAF 5200 bytes
SHA-256: fb024aefab11a5de7e117aabc610efb4899b30e69cfbece6851999cd07224000
font_01_sfnt_off0000c170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC170 12540 bytes
SHA-256: e864b4d2fd3c69b06931d363b103b4258a9a90b987373de33e8fc0ae127f1b78

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