Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b4cea82f2fc81b…

MALICIOUS

PDF

35.6 KB Created: 2020-10-04 01:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 53e7aac963f99f057051234956958d74 SHA-1: d9eacaa6d260b8841602c022e748cbefc1d87897 SHA-256: 54b4cea82f2fc81b868ad9f2a5fcceb22ecfa4734c32e2699f0b75a1ceb7f4c4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and redirector services. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content. The document body, though partially corrupted, contains a URL that aligns with this redirector behavior.

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://ggtraff.ru/strik?keyword=trilogia+50+sombras+de+grey+precio In PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/71928835837.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/mafefuvidinikelome.pdfIn PDF document text
    • http://wusazas.mercedbicyclecoalition.org/uploads/1/3/1/4/131407406/6565526.pdfIn PDF document text
    • http://files.advindmktg.com/uploads/1/3/0/7/130739239/tifadu.pdfIn PDF document text
    • http://files.moniquebosshardcurby.com/uploads/1/3/1/3/131383737/nuziravumi.pdfIn PDF document text
    • http://vafozil.lottglobal.com/uploads/1/3/1/3/131379874/7319189.pdfIn PDF document text
    • http://files.rogue-photography.com/uploads/1/3/0/9/130969433/2e68d25.pdfIn PDF document text
    • http://nupakub.adamfontana.net/uploads/1/3/0/7/130776031/kanike.pdfIn PDF document text
    • http://files.aftdoc.com/uploads/1/3/1/4/131452938/sipowulufukukasefom.pdfIn PDF document text
    • http://files.6thwilson.com/uploads/1/3/1/3/131398323/bimorir.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/96a40a61-6f8b-4297-93c7-f65abaf44e33/vesimamegun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6465e9b-8aed-4354-af13-082b8ab9028a/28233460073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13af6cdc-e82c-4c04-a8a1-79c84c3017e6/52408042330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fbd424-168d-4cac-bec2-5023638b911e/xepenugutoveralut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec02080-bc73-4251-b2d3-c5ca712a7c99/vowivopurakoxetigeviw.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_off00004d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D67 5848 bytes
SHA-256: e02fc54f5c2c18f3afd2447a025197202be1d7cf352aee8fa1722e6ee9b62401
font_01_sfnt_off0000613b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613B 9352 bytes
SHA-256: 2f005c0f9fce5b2319e1d564fc888025e8ab84e76363a1040496bd70c9bf15f3

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