Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe68fa874f50261…

MALICIOUS

PDF

42.0 KB Created: 2020-09-30 13:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab98910cc5e1553abe44805b52a59dc3 SHA-1: 40cc3e785074c2716627f10893db5dd7e42a3732 SHA-256: dfe68fa874f5026128fc9cff1285e8fd02005da4166030542a25fefd2a1a3b0e
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. While no scripts were extracted, the structure and URL analysis strongly suggest a malicious intent to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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/strik?keyword=baker+encyclopedia+of+christian+apologetics+pdf In PDF document text
    • http://files.maxlife.nz/uploads/1/3/1/0/131070588/8c454156362f.pdfIn PDF document text
    • http://togaribob.alisciayoung.com/uploads/1/3/1/3/131397983/73498.pdfIn PDF document text
    • http://tanir.jefferyedoherty.com/uploads/1/3/1/4/131438873/sajebowexolaxe.pdfIn PDF document text
    • http://dovipaxuk.jenniferritaahern.com/uploads/1/3/0/7/130775934/4786172.pdfIn PDF document text
    • http://xefog.icccevent.com/uploads/1/3/1/8/131856956/4389817.pdfIn PDF document text
    • http://files.srinivasan.co.uk/uploads/1/3/1/6/131606113/531cc3d2e4c3.pdfIn PDF document text
    • http://files.freedomhoops.org/uploads/1/3/1/4/131453536/9919727.pdfIn PDF document text
    • http://files.sargentirrigation.com/uploads/1/3/1/3/131383771/jokig.pdfIn PDF document text
    • http://files.digitalfxtbook.com/uploads/1/3/0/7/130739633/libedanofutinex_resigexetaw_nolesexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3275/4841/files/piperojabimapom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/cardiff_sixth_form_college_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f14f07-94e4-41a2-b0cf-f26c1cb96ce9/38358034828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8a841c-7acf-4be7-b619-4cce547e4b02/muvolixipujedomitapew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f947e1-6480-4565-81e5-00cfc38d60b9/kaweridudijiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074100ad-3c96-4da5-a456-2de4623bfe1f/mowadubepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5032ab6a-cdca-44c4-a434-fb9f22b5d270/64386628348.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_off0000656c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656C 5632 bytes
SHA-256: c154dd401f3117baf04a0551e48bd3166050dc07bf0d733d612a6ce84e91c1e7
font_01_sfnt_off000078a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A9 10048 bytes
SHA-256: c6b21640703abedb672aa6c60686edf4785bcf57e249f351756f9acac581c6e7

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