Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40a8ada193366ce…

MALICIOUS

PDF

37.0 KB Created: 2020-11-07 20:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6311111e498324a776a3f6b2f2e07adf SHA-1: 4a62c9dfd12048c5422171f6c09502f8b581a655 SHA-256: f40a8ada193366ce995841fc162da2479106f0bb116eafbea3a331ec201680b0
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. The embedded URLs, such as 'https://trafffe.ru/aws?keyword=west+lyon+football+2019', are likely used to redirect users to malicious content or phishing sites.

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://trafffe.ru/aws?keyword=west+lyon+football+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f9432e6529c6.pdfIn PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/57b8532769f45eb.pdfIn PDF document text
    • https://rujovisaz.weebly.com/uploads/1/3/4/3/134328318/lefus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5fa1e7e672ff9.pdfIn PDF document text
    • https://velizixevapejaj.weebly.com/uploads/1/3/4/3/134376636/95cf73edcb45.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/lopinalewivevexa.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/xomefaxafojudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fegaretu.files.wordpress.com/2020/11/sozosozanozejukubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34730996-4569-4a5b-8cd1-227726ce9eb1/2010_secondary_solutions_the_outsiders_literature_guide.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://gunilagaju.files.wordpress.com/2020/11/90524416601.pdfIn PDF document text
    • https://mudupetem.files.wordpress.com/2020/11/99665068368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bf0ea3-98c4-4793-9b4f-af91a4eb9279/lebron_james_letter_to_cleveland.pdfIn PDF document text
    • https://kedijabu.files.wordpress.com/2020/11/jinojulukugogonole.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_off000051b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51B2 5404 bytes
SHA-256: aeed9d3e0f48aa4bc00065b82ffa99914d2df7d5b64ae268a81ad656ff56c59c
font_01_sfnt_off00006439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 10296 bytes
SHA-256: 28182dd4a6612b5bbb0d3dfa502a6127cd6958609f15d7944b62d24454f1b167

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