Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f9b5277658eb1e…

MALICIOUS

PDF

64.7 KB Created: 2020-10-01 13:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ca828a93d92b5bd423990e786bc22130 SHA-1: feda933ead044c03c017b14a1fa6fb25f98b3262 SHA-256: d5f9b5277658eb1edda28ecbfc2020a6a7b84e75ae3958bc3e884af111fb7489
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=reading+practice+toefl+ibt+pdf In PDF document text
    • http://files.frontieradjusterssteveklene.com/uploads/1/3/0/8/130874134/5449624.pdfIn PDF document text
    • http://gimokavel.takeittothebankguns.com/uploads/1/3/1/4/131437299/aab6f218f.pdfIn PDF document text
    • http://zifon.iobcwa.org/uploads/1/3/0/9/130969950/7152418.pdfIn PDF document text
    • http://files.brandywinefarmllc.com/uploads/1/3/0/9/130969494/saratujupa.pdfIn PDF document text
    • http://files.studio-lady.com/uploads/1/3/2/3/132303083/rawuburukomuxuma.pdfIn PDF document text
    • http://kuxif.thomascalderselections.com/uploads/1/3/1/1/131164435/9828613.pdfIn PDF document text
    • http://files.greaterfaithndc.org/uploads/1/3/2/6/132696154/jinotobadalokidag.pdfIn PDF document text
    • http://files.cedgephotography.com/uploads/1/3/1/4/131453252/3fb31a923c8e.pdfIn PDF document text
    • http://files.alexandraportersoprano.com/uploads/1/3/0/8/130874580/bunokutexilub_fapufojawilunit_vinurilazebap_wavaxigi.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/b50396d3-0e42-4746-98df-e90693c19b46/15806859700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ec297f-b02c-40c9-837e-9990b75e7235/rodipigajenojaxuzomurafov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589d6f67-a9bc-4120-b9ee-d9b5e6b6cfbe/zomaverod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8933785b-2497-46d7-b3b6-219d35b9dbe8/46315028875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb95a63-9b21-4566-9cdd-4fdc070b8f6a/monatititenaxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58B 5292 bytes
SHA-256: 6752158c57934882a6a188f7114d893fc1c83ecd40f9a84c152c72dd7cd95607
font_01_sfnt_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 10880 bytes
SHA-256: 69f85f3774d4437612c4e897acd2c00e5ae5a38d3c769c609eadd6248b51f728