Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ca93caeca35fb2…

MALICIOUS

PDF

38.3 KB Created: 2020-10-10 18:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e632a78e977d110a6f73c9989fd8eaee SHA-1: 25a463be998058fdee3824bca1d140bd32263efe SHA-256: 50ca93caeca35fb243640b8c70e788cfe2a3e13d0a4e691d7727db69ed40ca7a
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=kaplan+mcat+biology+review In PDF document text
    • http://lawixafo.ikhlastours.co.nz/uploads/1/3/2/3/132303093/9422080.pdfIn PDF document text
    • http://wawoze.michiganrealtysolutions.com/uploads/1/3/1/8/131856331/1938115.pdfIn PDF document text
    • http://files.cedarviewbaptist.org/uploads/1/3/1/6/131606992/6f4cf4c.pdfIn PDF document text
    • http://files.woolstoncommunitycentre.com/uploads/1/3/2/8/132814096/7cc77.pdfIn PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/fiwanenubepowebutifaf.pdfIn PDF document text
    • https://site-1048444.mozfiles.com/files/1048444/56565343020.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/1/0482/9646/0443/files/fr_tony_oelrich_st_cloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332aa760-c7ef-46a6-b323-483514eb2882/73622077049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9198618-cfb8-4748-920e-7e23493bd093/zowasaneneza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580ce76b-da16-4369-b767-daf3b64d1cec/xuziragegunoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bdffe9-c9b3-479c-a4fa-220db48d2c35/52199121212.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_off000056a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56A0 5436 bytes
SHA-256: 0bbc515718a1b69747698d7dd144d31933f529d1d50ccc530a8b6b4535c02300
font_01_sfnt_off0000691e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691E 10496 bytes
SHA-256: 7642c6dfcb30cd33f6b572469c4da4fb82787637609d989bc100863712aedba3