Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb6babe4f3ec0ca…

MALICIOUS

PDF

41.9 KB Created: 2020-10-05 00:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22dd8bbf033cd1b615fec29c88cc31b0 SHA-1: f8ea7d0cb16d5db79fd2fd2935f34a0fba38f407 SHA-256: 3bb6babe4f3ec0cafeb27696c30e5ec234de048a4236026be4e1f74d24c2cf86
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. One prominent URL, 'https://gettraff.ru/strik?keyword=cifrado+americano+pdf', is identified as a malicious redirector, indicating a high likelihood of user compromise upon interaction.

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://gettraff.ru/strik?keyword=cifrado+americano+pdf In PDF document text
    • http://larap.judithmpiazza.com/uploads/1/3/1/4/131438860/pigesukujoletaba.pdfIn PDF document text
    • http://fadafi.anatomy-demystified.com/uploads/1/3/1/4/131406436/114d2a86.pdfIn PDF document text
    • http://files.gandecollective.com/uploads/1/3/2/8/132814967/c37800ac994539.pdfIn PDF document text
    • http://files.freshegggraphics.com/uploads/1/3/1/1/131164520/533d81.pdfIn PDF document text
    • http://files.youngsupholstery.com/uploads/1/3/2/6/132681602/puxowogumarewovuxu.pdfIn PDF document text
    • http://files.historianstevecampbell.com/uploads/1/3/2/3/132303138/bijopaxo_desoxeziwexuj.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/1/0429/5262/2236/files/que_significa_cuarentena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1964/6629/files/nipekuvumuretoturesanun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4634/6658/files/92542358489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8472/9502/files/jumeteji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4340ca83-7bb4-48c0-8254-8d44628bbf12/48413735773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb9f564-f163-44bf-be34-9a3a824b7ec1/tuvizegekuwukiworo.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_off00006611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 4996 bytes
SHA-256: e438e8d50eda25101e3c327e7faf8a5ba04cf5479bc90e051b5bd01dbe80a1b7
font_01_sfnt_off000076fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76FB 11236 bytes
SHA-256: f104d72e3e8e185681eb345b6c6ac0b7a871abe186d0353fdf56bc149ff74ba4

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