Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a5938bb71425bf…

MALICIOUS

PDF

40.4 KB Created: 2020-10-04 13:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4b4cb174c6c083fe9dfb9e9c5153bfa0 SHA-1: 27173b44e80184c4186d70216ab3df130ce50305 SHA-256: 15a5938bb71425bf744e7070e33be9a2f71cdd4bab46a8d529f02c028e172397
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://ttraff.club/pify?keyword=pathfinder+thrown+weapon+group In PDF document text
    • https://site-1042783.mozfiles.com/files/1042783/45886549710.pdfIn PDF document text
    • https://site-1038470.mozfiles.com/files/1038470/kusases.pdfIn PDF document text
    • https://site-1040682.mozfiles.com/files/1040682/wejepikaponotoju.pdfIn PDF document text
    • http://bifawir.westhebronunitedpresbyterianchurch.com/uploads/1/3/1/3/131398560/f947b.pdfIn PDF document text
    • http://nodev.larabranca.com/uploads/1/3/0/8/130874284/tomiwazufozotufufem.pdfIn PDF document text
    • http://sejobipir.productofthebay.net/uploads/1/3/1/4/131406444/jozused-gidinozodinapas.pdfIn PDF document text
    • http://files.marinlivinghomes.com/uploads/1/3/1/8/131871871/folonakaketote-jegowa.pdfIn PDF document text
    • http://newedopa.lawallab.org/uploads/1/3/1/6/131607163/1886671.pdfIn PDF document text
    • http://files.jeeperzoutpost.com/uploads/1/3/0/7/130775172/kegajovojeleto_sojibixetirow.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_off00006288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6288 5188 bytes
SHA-256: 287d15cdfc5434ff6201295b1b522c137fe60f18f9f73742c243787ab725088f
font_01_sfnt_off0000743f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x743F 9572 bytes
SHA-256: bcef260d1f9427b5102cf27f36f7d387a5deda4a414b7d94767cd422d60a96a7