Malicious PDF — malware analysis report

Static analysis result for SHA-256 27acdd5aa8dcabdc…

MALICIOUS

PDF

42.9 KB Created: 2020-10-12 01:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4770037f180d8518869d109a2c4489bf SHA-1: 64f63f150d21e938e8698d4897127f661658344c SHA-256: 27acdd5aa8dcabdc5f0825ee20587e69a6e593dde9296315dae30bb07f568b0b
184 Risk Score

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=happy+birthday+piano+sheet+music+download In PDF document text
    • https://site-1038694.mozfiles.com/files/1038694/17453977431.pdfIn PDF document text
    • https://site-1040984.mozfiles.com/files/1040984/doworemajujawubo.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/pifege.pdfIn PDF document text
    • https://site-1036744.mozfiles.com/files/1036744/tuzowa.pdfIn PDF document text
    • https://site-1039801.mozfiles.com/files/1039801/86607640623.pdfIn PDF document text
    • http://files.sascelledesigns.com/uploads/1/3/0/7/130775842/9516848.pdfIn PDF document text
    • http://files.dentistemergencysydney.com/uploads/1/3/1/4/131406288/mavareko-vokolanetemudag-nipagog-wavokafafumem.pdfIn PDF document text
    • https://site-1040601.mozfiles.com/files/1040601/jimepanojeliwuwi.pdfIn PDF document text
    • https://site-1039565.mozfiles.com/files/1039565/61768060979.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/11baea3d-00ca-46c0-8706-76bba55c237b/96306044121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b088dcc-2742-4713-a9b7-5ed60beb1eb0/5406988305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926d5767-ffe2-48da-bd3f-1de74666b9b5/41119137627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bb2e0d-329e-4079-9590-e309e2567746/zugexumutu.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_off000068ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AB 5608 bytes
SHA-256: a1fe27a4a4225e3ae05e57bea6149c5ceb085f8cf72cbde7c56150a60e13e2e1
font_01_sfnt_off00007b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B99 10320 bytes
SHA-256: 85f1aca11ea87fc6eec99bf3700ac106e837bc257263528d2779ff2f5affbfaa

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