Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e44a1fb9c3e482…

MALICIOUS

PDF

35.6 KB Created: 2020-10-02 16:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1f01f5e1a560c6e4d51d96c3886b3ff0 SHA-1: 0d6286f23d6259f7e52996d3005472c450a2d12b SHA-256: 33e44a1fb9c3e4822792c6a848f7276818232584a64aeb4a22b3c8af87ac5498
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO manipulation tactic. One of the primary URLs, 'https://gettraff.ru/strik?keyword=aashtoware+pavement+me+design+v2.5.5', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to software names and URLs, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=aashtoware+pavement+me+design+v2.5.5 In PDF document text
    • http://files.brandynoir.com/uploads/1/3/0/8/130814831/boxal.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/8ceedc47-df07-4e8d-8e13-85aad8ddb21c/doligikawamapewir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232e2be7-d841-4900-9ebd-27cc0ee5c1a4/10787629702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f354aa6-0b89-4ea3-a6ea-77dec380af04/50884310913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fc7909-3405-46cc-8760-3e67264d61fa/puloxuxopapilewobuwaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6953b736-9d64-414a-97f0-2a925538017f/pirikamevifovanabot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e27f05b-5a3f-446e-92da-8b097c252c6e/velaretukufenafebizokipaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d169c811-52a2-479b-9090-f06ec4498d34/napipitekoxijenovenilel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b495ee7a-fc8c-4c62-ad05-91d41ec29d26/xudijixexovegutuzegex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a31ca7e-295e-4215-989c-18a8aba3a4e4/2364770617.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_off00004bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF9 5768 bytes
SHA-256: 9a3060540e909e164f5cf51f741b2a2836c1a6f8e879d1056186d594af34d2a1
font_01_sfnt_off00005f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F95 10140 bytes
SHA-256: 6fd79c930e29ed1e32c439322cba6b99614e81eb586611521898e606bf6136d0

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