Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8369f5156f76d74…

MALICIOUS

PDF

48.4 KB Created: 2020-10-02 13:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ae842b305e9ed424a4c495cf5b27370b SHA-1: a4c60f2c398e58d622d28b77586c34a4b31074a8 SHA-256: d8369f5156f76d7408a5b95062c0ef2d7fd3d6b5da7857064422209f3e02cfad
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=resumen+completo+lazarillo+de+tormes+pdf In PDF document text
    • https://site-1042102.mozfiles.com/files/1042102/41943039795.pdfIn PDF document text
    • https://site-1039933.mozfiles.com/files/1039933/kozilama.pdfIn PDF document text
    • https://site-1038776.mozfiles.com/files/1038776/vesizuguje.pdfIn PDF document text
    • https://site-1038595.mozfiles.com/files/1038595/jukanuwupukakifaxavasunuk.pdfIn PDF document text
    • http://mirana.grub3riverway.com/uploads/1/3/0/7/130740055/matikuga.pdfIn PDF document text
    • http://dedomob.pauladoprado.net/uploads/1/3/0/9/130969352/9445964.pdfIn PDF document text
    • http://files.onestepforwardcounseling.com/uploads/1/3/0/8/130814014/583702.pdfIn PDF document text
    • http://files.nadco.us/uploads/1/3/2/6/132696274/ac432f2513b.pdfIn PDF document text
    • http://pulujox.pilgrimchurchspokane.org/uploads/1/3/2/6/132681352/bavawefututidurimol.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/fazunuwaxedozixuge.pdfIn PDF document text
    • https://site-1036775.mozfiles.com/files/1036775/1261779809.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/tekowimuruninefupe.pdfIn PDF document text
    • https://site-1036871.mozfiles.com/files/1036871/11493376493.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a5cbc4-b29b-4f1d-b827-2e177823abcb/74850328649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840d0e14-bfad-49f5-bfdf-e6ab2026019b/semefoki.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB8 5360 bytes
SHA-256: f0e850725573cb9c0bc5a4c31304181f6198a1b95f15ad1b8fb4434f358eb2c7
font_01_sfnt_off000091e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E9 10824 bytes
SHA-256: f9a10ccb0027d98e640d7428dbfd06c098daf0adef8f857049cffd4bd9304358

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