Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a74a08508abded…

MALICIOUS

PDF

41.4 KB Created: 2020-11-02 18:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c6f2ccda0420c75119f79d9e96b5526d SHA-1: dc6936434159779b7907982cb7150b21f218b9b4 SHA-256: 81a74a08508abdede72ee17ee8ab4fecdc0176b7a02d2993f4922e343509074e
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors. One critical heuristic identified a link to a known malicious redirector at 'https://cctraff.ru/strik?keyword=nightwing+and+flamebird'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary purpose is to lure users to malicious infrastructure.

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://cctraff.ru/strik?keyword=nightwing+and+flamebird In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8d72e44913b.pdfIn PDF document text
    • https://luvinazomefad.weebly.com/uploads/1/3/4/3/134308035/wironelibilo.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/mipuzabif.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/kumavet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f8d56a5e86a6.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/3253553.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/4010f08d.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/wodex.pdfIn PDF document text
    • https://wilujogid.weebly.com/uploads/1/3/4/3/134347442/2844e33ce148f86.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/b019c9b5-856a-4b92-92b0-41ee7a7e99e1/topufogeletijut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adb9170-6ad9-4e9d-993d-72835c62286e/84016929691.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_off000063db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DB 5344 bytes
SHA-256: 7d5fc7901abbbd1a7a666884fdf00bd9fe18a09409a835053e7ea495928725fa
font_01_sfnt_off000075fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 10216 bytes
SHA-256: 151e803a75367be177bf861e8a12b9906f9027078b5125ca028c97e713e76533

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