Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d4061735e25b94…

MALICIOUS

PDF

58.0 KB Created: 2020-10-18 20:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 289b65353412898caeab063bc87cb7d6 SHA-1: 759c303d75054095545012a86ffcc0faa2bb5a9f SHA-256: c5d4061735e25b94bd5d9f5d622e9fd1734adbec66e2cfdf8d7dc1731fa42767
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and a known malicious redirector. The primary URL identified is https://gettraff.ru/strik?keyword=skyrim+se+xbox+one+best+load+order, which is flagged as malicious. This indicates the document is likely part of a link farm or phishing campaign designed to redirect users to potentially harmful websites.

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://gettraff.ru/strik?keyword=skyrim+se+xbox+one+best+load+order In PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/757a132c443a.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/3794757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8b62f4ba4c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8932247c76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f8772488df57.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/5614093.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/bararowujilibuwi.pdfIn PDF document text
    • https://razezoxuwen.weebly.com/uploads/1/3/1/4/131453099/3978568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f8b6da3133d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f89e43bb9f5f.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/00793221-6482-4ef6-9572-725585c72053/witisipazuxosoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2334c2c-120d-406d-82fe-605d39d13c60/mopazuborex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f59d2d-230f-4ddf-b5f6-0e2ef8d2214f/ditamesageze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf5d386-ddc5-4533-8dca-934312fa85a6/72733062670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df0f6a4-bdf9-4910-adbd-fb188df649d8/zimexojugo.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_off00009f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F94 5448 bytes
SHA-256: 791d9988423e358ecea1efb73a54302c14751b7abe85eb4839bbfe5d414e3730
font_01_sfnt_off0000b209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 12416 bytes
SHA-256: 2430d3d721f541877afdfb44b4f10d6ce0bb901a478405ad26db90d20e3a8338

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