Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34c4bc2d520a257…

MALICIOUS

PDF

44.7 KB Created: 2020-10-16 08:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 642ab133ac93e8f3edc32f1596a2fd91 SHA-1: a9b12b82968b4027808f822ae23b7e843f7b250c SHA-256: d34c4bc2d520a25746f81fac219f5a61e2e6a3e8c79e3e56df3a9b6a7cb9b351
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to a URL associated with malicious activity. The document body also contains this URL and numerous other links to PDFs hosted on various platforms, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/strik?keyword=monsieur+madame+livre+pdf+gratuit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f871db1adeab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f87533f2b533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f870ee92667d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8744576a6fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f870baa16f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f88a7ac041b0.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/foburadip.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/jedewadizuzogez_supoxatarisi_kisoxafonopetes_zesikerurug.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/5785e88c9cd5.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3250b5961ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f8800dc07d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f88b2ec768a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f875bbd2222c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1f324392-8084-4de1-9e5d-e2eff11ee1d4/90888945736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdec1a78-5810-4d32-abca-13e4307e1b66/bivafekojirusumel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02541d54-ba60-4fd7-9286-728c38c59b69/40842584405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535fcfd7-65bd-460c-92c9-085ec4f50988/jifiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea6c729-311b-4edc-a3d7-e6d194ab3322/85629090867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5bceb3-801d-4185-8880-b605aa7e934b/vukutesirosabo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBE 5308 bytes
SHA-256: 0d52af342532a50ad4939ad29cfeb9fba503f30963bf09e53ebc9ba0641aa853
font_01_sfnt_off00006ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBB 12384 bytes
SHA-256: fd077774cd2e45a878f7542286fa2beee5103c99497ac70d04240474d4c2937c
font_02_sfnt_off000095d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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