Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9813555c95c2990…

MALICIOUS

PDF

42.1 KB Created: 2020-11-03 14:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a545ca48d0c10de175d0947b4c00accf SHA-1: 1b17b77bded898c4d7936c349d975e0648c113ed SHA-256: f9813555c95c2990ebdd200bfb2aba17606487f73964c61189ac72dcc8eee767
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document contains numerous links, including one that redirects to a URL suggesting a browser extension installation lure. The ML classifier and specific heuristics strongly indicate malicious intent, likely to trick the user into downloading a second-stage payload. No scripts were extracted, but the embedded URLs and the social engineering lure are sufficient indicators of malicious activity.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.link/123?keyword=add+ons+manager+google+chrome In PDF document text
    • https://bemuzulezevateb.weebly.com/uploads/1/3/4/4/134440878/jefokibi.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/debizikirapanas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_5f927e0d9e9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f86f4001a788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5f8b6fc3e5fde.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/niwibafeg_fixuxupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f88ba712fbe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f874f1ad8699.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/dc36c7acbec773d.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/86597551-2c98-4fee-bb1a-cb40e5e9871e/nowex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46de07d-5533-4234-bceb-c76a5fc2b077/beleralegegefuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3040ac-b588-48b4-b60f-730c308064fb/el_plan_revolucionario_fitness_revolucionario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990c500d-834c-4b8d-ba01-0b0b0d126cf5/48030701334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb62f12-c434-463d-ba73-23fdd8c3519c/36126886473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e087e7-e5a7-454c-9ea9-86debf982ade/17565911327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72b9cc2-e0e0-464d-90a6-9375b9b5d38d/descargar_juegos_de_ps2_por_mega_1_link.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f6a5ba-3ff7-4514-aeff-2226414d95e0/manual_de_equivalencia_de_transistores_gratis.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_off0000677d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677D 5340 bytes
SHA-256: 0ccfac013586aa203e2a37794f9e4ee9160e432bb4d87cf814f8ba5fad1d53e2
font_01_sfnt_off00007976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7976 10180 bytes
SHA-256: 451bd39da7f91600c35c124a95bc2462ddfebe5db4cf4b1e670194e650d302be

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