Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cb50d9d12d83d9…

MALICIOUS

PDF

70.2 KB Created: 2020-11-08 02:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 74c37f03e9e8570c452efba409b19702 SHA-1: 9e28e16200d97bfbfcdc1ef9629b196a0ca44bd4 SHA-256: 73cb50d9d12d83d927e7bdd452f3bb19dcfaad47099fb964c844372c71216d20
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/aws?keyword=brad+paisley+wife'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, with 'https://minezonateta.files.wordpress.com/2020/11/tipos_de_esfuerzos.pdf' being the first identified. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to direct users to harmful content.

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://cctraff.ru/aws?keyword=brad+paisley+wife In PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/godudewo.pdfIn PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/d85435212d278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f8fc532a4cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5f991c413c668.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/2390918.pdfIn PDF document text
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/gewepebok-nipumunanegi-bodunas-xenekutunoba.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/noxagogem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://minezonateta.files.wordpress.com/2020/11/tipos_de_esfuerzos.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/gotiwoxusivenovisel.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/povupinuwidaragiwakitawa.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/google_drive_file_stream_pc.pdfIn PDF document text
    • https://pavezisetapo.files.wordpress.com/2020/11/como_hacer_monturas_en_minecraft.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/how_to_justify_semi_structured_interview_data.pdfIn PDF document text
    • https://modiginofom.files.wordpress.com/2020/11/87357023494.pdfIn PDF document text
    • https://vipuvixo.files.wordpress.com/2020/11/92295293341.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_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 5276 bytes
SHA-256: 9824805a284bd9b16b5b72b3f73d3723019c2a0a3427fcf28419c131e12ea6b9
font_01_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 12016 bytes
SHA-256: e071c92352b82dc22a4824785699157f45ac59b46e04318f59b27ef67c082fe1

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