Malicious PDF — malware analysis report

Static analysis result for SHA-256 366720b02118f369…

MALICIOUS

PDF

42.8 KB Created: 2020-10-27 02:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2216451e0ec0f1cbb438c73b042608de SHA-1: 928b0d6ad72896bf87bb8b42d09d0ffc626b17e8 SHA-256: 366720b02118f369f95dbd07286b4a37b864c9926d600eb24c00b16f48c485de
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of numerous links and the identified malicious redirector strongly indicate an attempt to lure users to malicious sites.

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 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.
  • 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/pify?keyword=maths+textbook+grade+7+ncert In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5f97391e06a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f91833ed7677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f87760920055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f8ffa908b515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5f8d74c9504c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f96339d8af81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5f9751fd9a052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f874a15253ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f891489a26ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5f975313c583d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5f88f1bae9e5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9159/3883/files/examenes_de_laboratorio_en_el_embarazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8862/9926/files/anchor_of_hope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2448/2982/files/google_docs_frozen_2_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/sports_writing_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/raxejesegagifavatagenebup.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/muladekonuxipi.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/achyutam_keshavam_rama_narayanam_tamil_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/90742317072.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/soguraranupinot.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_off0000679c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679C 5524 bytes
SHA-256: 329a41e878735be037714e85fedf33db507880f70d0141caafa0282ee8410b34
font_01_sfnt_off00007a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6C 10512 bytes
SHA-256: 12fcb10e821e49a5ed8964814f0fa4cc5023185ba1880da0207655a713bca488

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