Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef93efab0577aa0…

MALICIOUS

PDF

43.6 KB Created: 2020-10-03 01:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d91a3a3bb086671d0f566a22a8862c29 SHA-1: b5d22f577150cf126860b650d17b4bf413d84308 SHA-256: bef93efab0577aa04ec99800a66b8cb02ad2764ecc3297a87c53fc3051381dab
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=zombie+frontier+3+mod+apk+uptodown In PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/pazidizex.pdfIn PDF document text
    • https://site-1036911.mozfiles.com/files/1036911/87454894358.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/92356634826.pdfIn PDF document text
    • https://site-1040514.mozfiles.com/files/1040514/41324384673.pdfIn PDF document text
    • https://site-1036881.mozfiles.com/files/1036881/zaxinalupuge.pdfIn PDF document text
    • http://files.capitalcitycupsc.com/uploads/1/3/0/7/130776503/siladavuwavo.pdfIn PDF document text
    • http://files.bossethomas.com/uploads/1/3/0/8/130874075/8bc71f89197.pdfIn PDF document text
    • http://files.northwoodilluminations.com/uploads/1/3/0/7/130739713/2f688a7601cc2c.pdfIn PDF document text
    • http://files.arcadiayouthcouncil.org/uploads/1/3/1/3/131382274/156e38.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/1/0495/9112/4131/files/30x30_multiplication_chart_printable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/52715687721.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/warapi.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
    • 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_off000057ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57EF 5396 bytes
SHA-256: 10f0a903fa6be95c146e684c31379bff5cc2cc126f076fe1d5874d78e0c02c47
font_01_sfnt_off00006a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A48 9952 bytes
SHA-256: d07e6165944371752cf5562922d4429c6038bf63e5af0731050ad3fb39602322
font_02_sfnt_off00008c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C95 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e