Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41905ffeee71e24…

MALICIOUS

PDF

35.4 KB Created: 2020-10-07 06:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: aede4412fb06494e54c2b3ea63f7f9bd SHA-1: 70c709f0bfe89a33ea7b9088bcf992e804dc8ff2 SHA-256: c41905ffeee71e249165531cbe19a4c45aa5fdf03adcbe1d2c7883089f9f5c24
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=the+freedmen%2527+s+bureau+student+worksheet+answers In PDF document text
    • http://files.hayletscommunicate.com/uploads/1/3/2/6/132681749/baxosatapumorin.pdfIn PDF document text
    • http://files.nonswimmingfish.com/uploads/1/3/2/3/132302754/sisuxelubusexuxus.pdfIn PDF document text
    • http://wegesi.sharpeningonsite.com/uploads/1/3/0/7/130776334/senodufezo_revalu.pdfIn PDF document text
    • http://files.jofreeman.net/uploads/1/3/1/3/131398477/9944765.pdfIn PDF document text
    • http://files.tamaraarmstrong.com/uploads/1/3/1/3/131384613/a7faa73af26559.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/42613702473.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/29027890321.pdfIn PDF document text
    • http://tajegupi.robin-shapiro.com/uploads/1/3/2/6/132695543/todivu_xafogewiti.pdfIn PDF document text
    • http://files.vikientran.com/uploads/1/3/1/6/131637498/lukapupojiwibof.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/1/0433/5442/3445/files/58557567275.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3924/3943/files/area_code_601_zip_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9437/9163/files/ohio_bmv_forms_needed.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_off00004bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF5 5392 bytes
SHA-256: 7e4bf7658c5925c0b87f113d709972ab275262eed64685405dd45e3b636d5e14
font_01_sfnt_off00005e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E39 10092 bytes
SHA-256: e143aca6cc36d391a472549074724c1b3fef159a1c43476f0c3225470e3e13a6