Malicious PDF — malware analysis report

Static analysis result for SHA-256 50951509e4afe6cf…

MALICIOUS

PDF

64.5 KB Created: 2020-10-04 15:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2cfab3f3e9ec38a31eb1d59a3b922d8b SHA-1: a983c341603773526e16fbe688dddea520f3f59d SHA-256: 50951509e4afe6cf4098282d457af1a91b4d7c083bef6417c951c7e0e9cdab33
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://gettraff.ru/strik?keyword=aerofoil+nomenclature+pdf In PDF document text
    • https://site-1039895.mozfiles.com/files/1039895/83056146380.pdfIn PDF document text
    • https://site-1041395.mozfiles.com/files/1041395/ripotizebevuwizupuveno.pdfIn PDF document text
    • https://site-1040512.mozfiles.com/files/1040512/35548783332.pdfIn PDF document text
    • https://site-1039785.mozfiles.com/files/1039785/mujaxid.pdfIn PDF document text
    • http://files.lexieslittlebearschildcare.com/uploads/1/3/0/8/130874218/4374596.pdfIn PDF document text
    • http://kodafoful.elportalschoolptg.com/uploads/1/3/1/6/131606666/3302135.pdfIn PDF document text
    • http://lavadukul.tidytimeservices.com/uploads/1/3/2/6/132680981/5344373.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/19fb0d2f-0aac-48cd-8e41-ba00b9abacb0/nulebuludedanokamelazek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162fefd4-492e-4fef-97ff-f0c4d4894197/67856138810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d36d9c-322c-4d31-b23c-b9385d93e74b/danibaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7eff61b-d888-40b0-9d14-7db0b7f9beb8/81046098477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50697e8c-9b65-4a8e-90d6-871e3dfd1c1b/lonuwegozarej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a063a69-2dbf-4f89-9bda-5b2ffed405af/57968263034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e305b78a-8fd3-4244-ab2c-f19b7abc41c0/joxiropoxobavotalalifi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B04 5112 bytes
SHA-256: 045ba1e6e5a9245b14e076d7d5819f0b967ea55ce34952caed920915472fb321
font_01_sfnt_off0000ac55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC55 16008 bytes
SHA-256: dfc06fec87f3114a9bf9ccafc87f24609b3ef405f63d57f6c4558495e7b81dcb
font_02_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 16064 bytes
SHA-256: d7bba43471984fde62ee25506053f4468e5348dda9e6b0ee5126d021e3aea99f

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