Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1242c9741b72cf…

MALICIOUS

PDF

33.8 KB Created: 2020-10-10 15:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a10f7535e3f7590e91c3b3522c4f0ee9 SHA-1: ab6c89673292bb8b060abbcbd1a3e60a68d9f9d1 SHA-256: ad1242c9741b72cf9c83efd403c20d83e15d8f5d0ad0de3ab43f882d10f921b1
124 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains numerous embedded URLs pointing to redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically identifies a link to `https://cctraff.ru/strik?keyword=katawa+shoujo+gallery`, indicating a likely attempt to lure users to malicious content. The document's structure and the high number of distinct, disposable hosting domains suggest a link farm designed for SEO poisoning or traffic redirection.

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/strik?keyword=katawa+shoujo+gallery In PDF document text
    • http://pujatopeb.drkimberlycharper.com/uploads/1/3/0/7/130776433/7360435.pdfIn PDF document text
    • http://files.valleyrootsfoodhub.com/uploads/1/3/0/7/130740344/fa8b50ce.pdfIn PDF document text
    • http://zitilezo.victoriayoga.co.uk/uploads/1/3/1/3/131381067/rasuni.pdfIn PDF document text
    • http://kawube.chevron.ie/uploads/1/3/0/7/130776021/joduvu_vubumufixaf.pdfIn PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/razagoxep.pdfIn PDF document text
    • https://site-1041183.mozfiles.com/files/1041183/83984316213.pdfIn PDF document text
    • https://site-1042094.mozfiles.com/files/1042094/wibuliwekototen.pdfIn PDF document text
    • https://site-1039608.mozfiles.com/files/1039608/57445449867.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/30767179916.pdfIn PDF document text
    • http://files.milkshedcatering.com/uploads/1/3/0/8/130874009/bepapawizofes-magodububozelez-perezodevil-gotofujuxiv.pdfIn PDF document text
    • http://pezature.womenofthemorningstar.com/uploads/1/3/0/8/130814623/3166059.pdfIn PDF document text
    • http://files.ftc8496team.org/uploads/1/3/1/3/131398148/gowedutolijenaxixu.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/2b8dfb5a-b0ef-4d0c-9f4d-0ba0ce74ad78/35616045101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af6ac99-6e03-4169-bc72-ca29c24ca0ba/xojatape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0bd925-98e2-4ade-8097-644292e24de0/62428138862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60391a11-7d6f-4acd-8b1d-4fef9034a543/55624701034.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_off00004630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4630 5184 bytes
SHA-256: 91fe61c336f533796ba355e48ee3ce533f0fa7aa1f4be85b91b4ec2311870bf2
font_01_sfnt_off000057f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57F0 10196 bytes
SHA-256: fbc748e93f12a811a608d136970e694a7571154d794299c8edfdb0cd8ac5e3ef

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