Malicious PDF — malware analysis report

Static analysis result for SHA-256 85415034af4a6541…

MALICIOUS

PDF

48.4 KB Created: 2020-11-01 19:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cdafd8c9c691152033d8b9ccb5f42dcf SHA-1: b61c5347d7623b36eb2f658d0af5cc9c7efa8bdb SHA-256: 85415034af4a65416d02504f2e75057576a7aba6ff39c8a96bb502eaabdddbe4
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Gold gym 290 exercise bike manual' and the malicious URL. The ML classifier strongly indicates maliciousness, and the link farm heuristic suggests a pattern of disposable hosting for malicious 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 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://cctraff.ru/aws?keyword=gold+gym+290+exercise+bike+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5f9046eade46e.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/magibelu-pokud-bixitufaguzapi-baraxoxa.pdfIn PDF document text
    • https://geguguxe.weebly.com/uploads/1/3/4/5/134513061/2881548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f96daed05d4d.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/eaccb7992dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f89d3ab4fce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f9473ec52b81.pdfIn PDF document text
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/8885801.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/e5b159ca27cda3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/156eed98-881b-4ec7-af69-e73ba4d9404f/23310494176.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/comment_joindre_2_fichiers_en_un_seul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd03c96-4d03-4fee-81d6-dd866b087a90/the_interlinear_bible_hebrew-greek-english_interlinear_bible_v._1.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_off00007b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B68 6092 bytes
SHA-256: c82962e5e2ee90e93d8a92fb4ce0cdb3716ffeb5fa3ecf2ef729cee811f86342
font_01_sfnt_off0000901a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901A 10820 bytes
SHA-256: 3dce37d7967fb11657d528f8434d8e2f502f65b3babcd43109b9e606b5b36d48

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