Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9da44e3387be9c5…

MALICIOUS

PDF

39.8 KB Created: 2020-10-04 22:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8851c1bf76d0fa4ec58321ec4ad060ff SHA-1: fea523a7a1882d889415b5d64b579793c8a8749e SHA-256: b9da44e3387be9c567e337ff0c98dedd22613edbc94062d1fbda00fa5ded9c1f
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting and appear to be part of a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that likely serves as the initial lure.

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://cctraff.ru/strik?keyword=bob+dylan+hurricane+violin+sheet+music In PDF document text
    • http://files.tnfederationfortheaging.org/uploads/1/3/1/1/131163927/fugajofoxijejiv.pdfIn PDF document text
    • http://zonoki.sailrockland.com/uploads/1/3/0/8/130814328/84b400d.pdfIn PDF document text
    • http://files.islandbred.com/uploads/1/3/2/8/132814468/xigonixaxuvi-butobise-fonomabafexo-bemijufi.pdfIn PDF document text
    • http://files.alamovalleyconstruction.com/uploads/1/3/1/4/131408027/4630725.pdfIn PDF document text
    • http://files.ripples.us/uploads/1/3/1/4/131452944/8756486.pdfIn PDF document text
    • http://files.thescriptnederland.nl/uploads/1/3/0/8/130814083/bikegogavum-laxovenafidoz.pdfIn PDF document text
    • http://jineku.aaronyee.com/uploads/1/3/0/7/130775320/375228.pdfIn PDF document text
    • http://files.kimwhittingham.co.uk/uploads/1/3/1/0/131070258/sufenuzi.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/04861283-a37b-4762-943a-8fad02e671c5/nizedilifilinikabelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd0203b-a3b5-4d8b-a7a6-c8b9243b9250/napalukaratonewudowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61173b66-6c97-4c28-9510-57b2a9225afe/safafojafevo.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_off00005bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB8 5528 bytes
SHA-256: d15d50a77165df1d82b5c11ffc073c116c90a78f43b648c1bf4a9e54c0ba6d82
font_01_sfnt_off00006e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E68 10636 bytes
SHA-256: 0c57c274a989278acda64fcc4a259fbc0f1e796a0c1bd4a3628fea9fee3c65c0

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