Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d440d83b9b4deb2…

MALICIOUS

PDF

36.4 KB Created: 2020-10-09 22:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f1f25eb801a7d34c41529fc255886c7b SHA-1: 7fc9d5b2df10f54e032c7a0ee1812a9f38188a90 SHA-256: 4d440d83b9b4deb24e84919f92b69805cc1fa89ebf82e7c4f91b795376dcc743
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=houghton+mifflin+california+math+grade+6+textbook+online In PDF document text
    • http://files.artistmikemeermann.com/uploads/1/3/2/7/132712558/sadoga.pdfIn PDF document text
    • http://files.cruisencocktails.com/uploads/1/3/0/8/130873759/wurilogirowuwofokiga.pdfIn PDF document text
    • http://files.sacredvoicestudios.com/uploads/1/3/1/4/131438176/2404407.pdfIn PDF document text
    • https://site-1039573.mozfiles.com/files/1039573/27715816184.pdfIn PDF document text
    • https://site-1039797.mozfiles.com/files/1039797/79178625514.pdfIn PDF document text
    • https://site-1040104.mozfiles.com/files/1040104/78152995007.pdfIn PDF document text
    • https://site-1038946.mozfiles.com/files/1038946/gojed.pdfIn PDF document text
    • https://site-1039513.mozfiles.com/files/1039513/7123905722.pdfIn PDF document text
    • https://site-1036917.mozfiles.com/files/1036917/72568031736.pdfIn PDF document text
    • https://site-1039602.mozfiles.com/files/1039602/20502295208.pdfIn PDF document text
    • https://site-1036910.mozfiles.com/files/1036910/37033702747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000507f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x507F 5644 bytes
SHA-256: c10e5c309f4e5d1750aa4fdcfbe62e34aa61cf24b646362535d1094103f04786
font_01_sfnt_off0000638d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638D 9744 bytes
SHA-256: a4e0f8a1f9a51a2c1631445740d43ae5a9ca2f4a72c81b85b750358b5bbd1fc5