Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3eca8d322fd3697…

MALICIOUS

PDF

41.5 KB Created: 2020-11-01 13:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 00e841b7ef3da9307b28717247308357 SHA-1: 2db741995dc6f13483779032b755a77b9f0770d4 SHA-256: f3eca8d322fd3697bb67bef6f0570f2220ad9009ff7b22d0e0158a4a322d7dbe
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains, designed to act as a link farm. One prominent URL, 'https://gettraff.ru/strik?keyword=unblocked+racing+games+3d', is identified as a malicious redirector. This suggests the document's primary purpose is to redirect users to potentially harmful websites under the guise of providing game downloads.

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://gettraff.ru/strik?keyword=unblocked+racing+games+3d In PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/kunuja.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/xopilewag-gijil-vopufedis-davuwejujiner.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/82b03f8fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5f91130e5a493.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/5167020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5f92cc0846575.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/pizexopenaxu/eset_nod32_antivirus_9_crack_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8394/8728/files/sijebe.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/free_robux_generator_no_survey_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc9fac5-401b-4e5b-afc2-1c40fd22b8d8/arkansas_native_plant_society.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09595db-b57d-46d8-87c6-455e292b2f0b/7827025745.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/digusobedezogufove.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_off000062db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DB 5616 bytes
SHA-256: d5ae6bcd06b01283f5c3230d014eca0b35b077172b4152148149fa13affae21c
font_01_sfnt_off000075dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DD 10408 bytes
SHA-256: e6200dc757397f8d7cab602c687051d9e396a9b30c1511ef528cb63f948023fb

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