Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd676112575435a…

MALICIOUS

PDF

45.8 KB Created: 2020-10-01 22:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 0c4fcd699fb6ab3fef7f1c3a5b5a45a3 SHA-1: db8853c0e2dc267f4f4e09ef7786a73be6c0dfb7 SHA-256: 3dd676112575435ae8f1038e89318a68b5ef88c4d251832e30e14483442839ec
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://cctraff.ru/strik?keyword=area+and+circumference+of+circle+pdf In PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/wepufazozadufosasujo.pdfIn PDF document text
    • https://site-1036938.mozfiles.com/files/1036938/39584207240.pdfIn PDF document text
    • https://site-1036756.mozfiles.com/files/1036756/paxoluwotabenowuzobuwex.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/97243415639.pdfIn PDF document text
    • https://site-1039341.mozfiles.com/files/1039341/31011245127.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/jeredofipukojatinoxadowa.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/27239570293.pdfIn PDF document text
    • http://kisalogun.nyunderground.info/uploads/1/3/2/6/132681946/cf77bdc03d.pdfIn PDF document text
    • http://files.cooksbeachresort.com/uploads/1/3/1/4/131406558/243159.pdfIn PDF document text
    • http://files.fusedaledesign.com/uploads/1/3/1/4/131453990/fesitafekexasisovub.pdfIn PDF document text
    • http://files.godwinacupuncture.com/uploads/1/3/1/4/131409090/9224530.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F36 5112 bytes
SHA-256: c9baeaf1e058c7f07aab161493683e94d21e21c641fec918e2006bc35ebf748a
font_01_sfnt_off00007089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7089 10816 bytes
SHA-256: 11f6e49c4265979cd1608eee8203c1b1b9159cdd0123a64c84a7472c151ef6bc
font_02_sfnt_off0000957f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x957F 16076 bytes
SHA-256: c6e5a50beeb96386e46c13b851249bedf13903b0e4c64ff4170c933eeab0380e