Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bf8f5ec7f39708…

MALICIOUS

PDF

31.4 KB Created: 2020-11-06 01:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6229ed5cdb10b2a4c94ab994cdb96889 SHA-1: 600e6b3fe2c7ec7cb4f99158466cece411da4511 SHA-256: 82bf8f5ec7f39708369d55a6fe40db73dd707393566effebbf2f27e1566ba7bd
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file is identified as malicious due to its structure, which mimics an image-only document designed to trick users into clicking a link. The primary malicious URL, https://traffine.ru/strik?keyword=blue+collar+brilliance+rhetorical+analysis, is a known redirector. The document also contains a large number of external PDF links, likely for SEO manipulation or to host further malicious content.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 31 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://traffine.ru/strik?keyword=blue+collar+brilliance+rhetorical+analysis In PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/156703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_5fa48ea5c16ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8b235d62ae9.pdfIn PDF document text
    • https://nokurujifeseg.weebly.com/uploads/1/3/4/3/134355409/5645248.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/2e302747-a2b0-4fc8-9a8c-2ef2b7bb5ed1/89156649835.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/como_no_aprender_ingls.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/medebuxovipu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/71039190826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eec8232-f358-40fe-9189-d168baaab56e/adverbios_de_modo_ejercicios_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca1e2c0-b4fe-4586-8fdc-6a372d168ab5/64746234367.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/regejugitagutijubuvev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e191fd-43da-4c02-b477-929d28fd3ed4/jotujusagabapuke.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/digeibira_2020_inscripciones.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_off00004452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4452 5180 bytes
SHA-256: ab81de1890357bd73c7717278916fbc21fbdbc24a220877907d48207c0008af3
font_01_sfnt_off000055ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55EF 7868 bytes
SHA-256: f13a3de8ced0f04f337076a47cee9348977ec44c4dcc509a26cd3052f7150ada

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