Malicious PDF — malware analysis report

Static analysis result for SHA-256 540a4e2bbf26cf60…

MALICIOUS

PDF

43.0 KB Created: 2020-09-30 08:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f0aae9c0eeb0c2d90093d09f25b48702 SHA-1: 358381e407d478de26956e0e1c346459beb5f0e3 SHA-256: 540a4e2bbf26cf602a61e37104c9513b1801e114d9b2a7177611397b5307bba6
194 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/strik?keyword=advanced+synonyms+worksheets+pdf In PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/59092031034.pdfIn PDF document text
    • http://files.marcytcm.com/uploads/1/3/0/7/130739697/bevuw-mitexopale.pdfIn PDF document text
    • http://files.justirrigation.com/uploads/1/3/2/6/132681513/soxojisabolufo.pdfIn PDF document text
    • http://xonuwa.chairelectoral.com/uploads/1/3/1/6/131636644/3700603.pdfIn PDF document text
    • http://files.stonehillkennels.com/uploads/1/3/2/6/132681495/paralakoriruwom-fibor-bilele.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/d182fe96-c1c4-486a-87c2-8c2a8a1a1bfc/fesolutuwofopediz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0245fa08-223b-4e6c-bf84-89e98a3519fe/84561057682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cc3e7a-fc76-4e24-89e1-64f4d186b0bc/dobekiwewojasebutetos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58915751-c35d-4a86-907d-3907dd6e5f6c/5666273204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfe647b-abca-489c-889f-555670373c4e/renoluripuwinumafarer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce27a5e-3aba-4f4e-a7bc-e35ffd349819/60425653566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ff9b1c-eb86-4414-ba05-73a8a9b3fb82/69701095381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02534d59-6496-4cbf-a3c2-a161a6002e44/rijapifuwamisedimod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bcdbb1-b5a6-4b83-a5b2-00ea9d1f65ba/45267135484.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_off000068d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D7 5668 bytes
SHA-256: e2d3262d66e7236e0f79a7aef66ddce640bfc799e2aab6f387ab9cdc64ca7876
font_01_sfnt_off00007c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C11 10272 bytes
SHA-256: d31ff2e63add50d696bed812d8980480cc7e71c836d10c445656059fab7cd09e

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