Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50a76250b494171…

MALICIOUS

PDF

62.6 KB Created: 2020-11-07 23:06:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 12057ae83355aeb563d929373672af32 SHA-1: 1e25ac853006b8da2541181313cae415ead216ea SHA-256: e50a76250b4941712f639958070dd2918cae17f4dab5a73a6e91bdd51975ea11
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm. The primary URL, 'https://traffnew.ru/123?keyword=unblocked+games+cool+math+games+bad+ice+cream', suggests a lure related to search engine optimization or potentially phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and embedded URLs indicate a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?keyword=unblocked+games+cool+math+games+bad+ice+cream PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8c8f875323a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_5f973b06f3c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_5fa07ee02a303.pdfIn PDF document text
    • https://wekasekizoturir.weebly.com/uploads/1/3/4/1/134131482/8595e5dd.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/1603386.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/2375669.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/207057.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/zuxadol/39632401091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294ac1a9-21ef-46eb-8771-251c8c4a5a1f/leturakesujukabunotero.pdfIn PDF document text
    • https://vuxogomirus.files.wordpress.com/2020/11/mitsubishi_fuso_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d8e039-6036-4375-96d0-52102d665f56/the_things_they_carried_characters_who_died.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.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_off0000b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29B 5548 bytes
SHA-256: 9b7fd038c1a1be047fb171d29e172a4d1d025a73096995805e9edac96266fc33
font_01_sfnt_off0000c54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54F 11632 bytes
SHA-256: b1dcd9fb742286fb06915a3ca633747e6ab953b83f26d02870f893a63a62e5d1