Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89920c4c4230e1a…

MALICIOUS

PDF

38.8 KB Created: 2020-10-04 03:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 17d0f34c2ce8611a1f58018884a2187e SHA-1: b20bfd52f78386572a5aed89b2fd3b51047837dd SHA-256: f89920c4c4230e1af12dd5fd99d87cd5bdb0b96662c41e3eb107ac3f98b29b48
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://ggtraff.ru/strik?keyword=angles+of+polygons+worksheet+answers+6-1 In PDF document text
    • https://site-1040313.mozfiles.com/files/1040313/rukomatawebebola.pdfIn PDF document text
    • https://site-1037916.mozfiles.com/files/1037916/woxusipiju.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/46989594642.pdfIn PDF document text
    • http://files.narsa-us.com/uploads/1/3/0/9/130968942/d5db3e.pdfIn PDF document text
    • http://files.hellogorgeousre.com/uploads/1/3/1/0/131070561/ligizaki_pafigutowag.pdfIn PDF document text
    • https://site-1038650.mozfiles.com/files/1038650/82003855598.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/xokojawudituwekelimodepot.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/1/0481/4906/9991/files/bevulorojubife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/ff7_buster_sword.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3513/9477/files/72475090396.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_off0000592a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x592A 5648 bytes
SHA-256: 826a640c45801cd08a3f1d8bc294d3286cd32bc4c437bcbfac3d7a98573bda50
font_01_sfnt_off00006c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 10000 bytes
SHA-256: e280f6101f803b2a15f012815c564c90d965167184955d966319bbcd0ae497a0