Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafacf28a0231a40…

MALICIOUS

PDF

37.5 KB Created: 2020-09-30 13:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 18fe73dba835c0d135f69fd29295daf8 SHA-1: 1817e763b82d21916565b7c0f2e131fdbd775f42 SHA-256: bafacf28a0231a406147ed5272937e2f50cf98b94740bcc6a02c4afb61086771
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://gettraff.ru/strik?keyword=american+english+file+1+teacher%2527+s+book+pdf+free In PDF document text
    • http://files.bloombargain.com/uploads/1/3/0/7/130738636/3594547.pdfIn PDF document text
    • http://files.jonathanedgingtonwriter.com/uploads/1/3/0/8/130814225/fifodudomakugeruzul.pdfIn PDF document text
    • http://zupipedat.dianehulseartist.com/uploads/1/3/0/7/130775129/0c504b0fc4b2f91.pdfIn PDF document text
    • http://gowesiw.personalrenewal.org/uploads/1/3/2/8/132814900/galikil_walewezemikab.pdfIn PDF document text
    • http://files.jessicakimsociology.com/uploads/1/3/1/8/131858592/d6c45381bcb2.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/92800771013.pdfIn PDF document text
    • https://site-1037132.mozfiles.com/files/1037132/53292797732.pdfIn PDF document text
    • https://site-1038360.mozfiles.com/files/1038360/92438244785.pdfIn PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/16562834381.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/43390155931.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/6247742021.pdfIn PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/komawisenoliragagoj.pdfIn PDF document text
    • https://site-1036971.mozfiles.com/files/1036971/15988884162.pdfIn PDF document text
    • https://site-1037024.mozfiles.com/files/1037024/73602898649.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_off000052af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52AF 5848 bytes
SHA-256: 64b9a04937bb620cc23b5e8e3748291ffd76fa5057b7c35da2ba60d2f5df7779
font_01_sfnt_off0000667b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667B 10160 bytes
SHA-256: cbd8812d84b78ffc875c1ead54755a3ae9cbd976f3833a31aa4527caf0355d50