Malicious PDF — malware analysis report

Static analysis result for SHA-256 692db3fda14bbaa8…

MALICIOUS

PDF

40.1 KB Created: 2020-11-04 14:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ce1c8b76d870d984c2ddea79c114f60d SHA-1: 80f82d7a7685469b46d5841aa09278f5999512f3 SHA-256: 692db3fda14bbaa871c2d12b1c87593227d867a6c7b84c90b3aa98a66cf8dc6c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent, likely to redirect users to harmful sites.

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://gettraff.ru/aws?keyword=models+2020+conference In PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/caa0b4938e76373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5f9dbe956f859.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/225cc1956.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/wasotapuxazovu_mebajuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5f9b7281ccb7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f888ad026a01.pdfIn PDF document text
    • https://voletiga.weebly.com/uploads/1/3/4/5/134501602/9627456.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/wonoti/79842324192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5c1bc3d-8517-41d4-a86a-c1bee0061fcb/resistencia_de_materiales.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/car_rental_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/endorsement_letter_for_ojt.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/topukokigaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae17bddd-65c9-4637-943b-0f75674473cc/cities_in_alberta_canada_with_zip_codes.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_off00005e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E78 5084 bytes
SHA-256: 9da2608149c9993d1d46614011b20c0565b84227986d496c272238f26ce6e772
font_01_sfnt_off00006fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE4 10652 bytes
SHA-256: 43fc395f0164df461b7f5d47043e71d4ea1d80ae0d2ef4e79987b5a8263d2285

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