Malicious PDF — malware analysis report

Static analysis result for SHA-256 f760268231cc3643…

MALICIOUS

PDF

40.1 KB Created: 2020-10-18 20:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 922fd7477a4bc185c8235c915f447fa1 SHA-1: ff22a211214c4b95c3b05b2a0ee8a93f80b4d0eb SHA-256: f760268231cc364375e28cc5aa8987eb9b5ee8477b7b18962d55fdd0f2d29781
154 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=zoomer+zuppie+instructions', which is designed to lead users to harmful sites. The document also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution campaign.

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=zoomer+zuppie+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f874b7f92a9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f884d4a3846c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f876438af848.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/1e899259-2640-447f-b211-a01674de4874/kazuwigalomuvukoxajositi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7589/3918/files/zombie_pigman_minecraft_removed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6617/4871/files/14007149903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e4413b-5ffb-4f50-9929-ac2d1059f50c/razeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a5273a-cc06-4418-865c-c6be13d07b97/3397680109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cddd4f9-e560-4c67-aa09-d2b1aabe9c50/79238014633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9ed0bb-a2f8-42dd-92a1-82b260fc980d/48217856525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b333c6-110d-4924-9690-d18f9f3d262c/46428870502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b70d18-f6b4-41b1-ad31-f2822f6ed401/59298025794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f067d26-1737-4a21-ba18-4fe30ce4ed68/bulupomilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d0afb4-8987-40ac-8d31-04417d53e17c/juvagesikidenole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba0d75c-7195-4444-b19c-2d5283ea1f66/download_mp4_memes_terlanjur_sayang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d1f6a4-a993-4284-a76e-aa3094ea5770/jeff_buckley_lilac_wine_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a65d9d-504c-4a1f-8bdd-7f2e0f98734c/vijulumepeju.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_off00006089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6089 4844 bytes
SHA-256: 88091ac07b1daf6e709ea09589a089b7ed62b9841df67c795d55c2a117e6a1fa
font_01_sfnt_off000070f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F3 10116 bytes
SHA-256: 6330cbeb843562e1ff433238de35bd752e51477014c37a3ac2e747b7bf0a69cb

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