Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c1d9132b4f66f7…

MALICIOUS

PDF

41.8 KB Created: 2020-10-25 17:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7a765ae55b86aaa4956751fec451ecb8 SHA-1: 343ce95e303e6c0635e6a9bb625c0cf2a8aa9edb SHA-256: c7c1d9132b4f66f7d5cca05fb7d148ece90041ddc0b442228d47821d39282b9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://ttraff.ru/123?keyword=wordly+wise+5+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8eed5305fef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f8cec426a257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5f8b2650db57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f8bd247a5b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f8c01550cece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f889edab1fd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5f8ac0529a8c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f88b58b5ccae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8be1bb62f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5f8f261adeda9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f8da25ae55f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f870c206f795.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/babetafaperaxov/58594556259.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/2039828387.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/datibava.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/temajifewuru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6528/6549/files/scrum_product_owner_checklist.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0390/2619/files/6848143459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9544/8988/files/arclight_cinemas_pasadena_telephone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2931/8813/files/bebus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5646/3015/files/lowikituretogelodomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf19d17b-fa03-4e30-add6-883ec0688508/52323542864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b42d8f-9eae-4e19-bfea-38c82877fef0/87395958458.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_off000062d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D5 5156 bytes
SHA-256: 30f348835bb4ff64d724b1c51ecc7653fada7fc9aee784fa2fe3d98b24e6447d
font_01_sfnt_off00007499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 11840 bytes
SHA-256: aaefe0969756a1f23cb965314f35e0e48d614b4fcadce214e0b47e573651e626

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