Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ca797c4a3f0b19…

MALICIOUS

PDF

60.5 KB Created: 2020-10-03 10:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: af6e0b717a82fbb849193853802a128a SHA-1: e4b0520fed7b7ff80cfff5869e2279051fcc3a1b SHA-256: 31ca797c4a3f0b19ec8fccadec2616084b0ad556812a3cffffc8e5279ad11c91
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=rotafolio+de+alimentacion+complementaria+minsa+pdf In PDF document text
    • http://files.mojamaican.us/uploads/1/3/0/7/130739028/8369220.pdfIn PDF document text
    • http://xubil.tattnallarchives.org/uploads/1/3/1/6/131636627/posazo.pdfIn PDF document text
    • http://xesij.trinityjamestown.com/uploads/1/3/0/7/130738765/1ed3b4310ff1.pdfIn PDF document text
    • https://site-1042665.mozfiles.com/files/1042665/8308677105.pdfIn PDF document text
    • https://site-1038618.mozfiles.com/files/1038618/vevavikiluxazalilozonugiz.pdfIn PDF document text
    • https://site-1036881.mozfiles.com/files/1036881/95292016943.pdfIn PDF document text
    • https://site-1038940.mozfiles.com/files/1038940/ruxemufivuvojelarige.pdfIn PDF document text
    • https://site-1040977.mozfiles.com/files/1040977/2350224019.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/ee00324a-c30c-4916-8bca-aedde30e0ece/37466796788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b7aa41-002d-4726-b6c0-a9764e488160/37572428004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb386c2-68d3-4210-afc7-e21e4ecdd579/vejenumezisodejef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edac15a9-70e3-4656-ad40-056a112d8d23/tarepimemejonuxone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292c66c6-4af1-4ca2-8fbc-41a6d83ac11c/gaxaxojeximixu.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_off0000a85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA85F 5308 bytes
SHA-256: 1588a43a1da0e2a3f20bd6e78fe7e7b01f852ce687e09d2f8587049993731d9d
font_01_sfnt_off0000ba60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA60 12728 bytes
SHA-256: 1ddb4da54fb26c17c1a6734aa6a4f17f647e8b8b91b0e148078221d69ba6e625