Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c556afab1b03cb9…

MALICIOUS

PDF

44.6 KB Created: 2020-10-30 14:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a65f3691b9ecffb1fb87501f3f6dcf12 SHA-1: cb37c0c55949eb21e2ac6244ed97cdfabc906ec7 SHA-256: 4c556afab1b03cb9f5f4b1865d8bf83dc96983536b2e5d638f0c11630d47c742
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.me/123?keyword=multiplying+two+binomials+calculator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f89397ee8d71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_5f8ae7f0dabd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5f981a59d8afe.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/0ad8d41c-b438-42c7-8525-c845a9aac0ea/16906582506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e56714-ae6f-4d8b-979b-ac6540fe37fe/kobize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcda295a-4950-4822-836e-a87e01ea6eb4/ribudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb61d23-30e1-448a-8970-73c16b517b10/pltw_design_process_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d871943-2589-4c54-9c41-d38c8c9128a2/hipnosis_ericksoniana_tecnicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11560eb-d16e-47e0-a08a-48ef0ba4acf2/rezovekigenitepajubopas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e1b5db-db62-49fe-b254-f81363eed454/26939120241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe20d4b-17c3-49e3-a0e2-bd5960820b6f/laminas_de_rexed.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_off0000570a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x570A 5592 bytes
SHA-256: eb659362b1a4a1c48cb830b9a07d0d92a1092094e00f0c1722e6f916145c107f
font_01_sfnt_off00006a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1A 11232 bytes
SHA-256: 569d3f38698b2b42ec20d8fef17ea95bbb390b347159a9bdd6590fcc46342be0
font_02_sfnt_off000090b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B7 16080 bytes
SHA-256: e3d583ca8131484f6b7e9991674a220a85ec8466745261d702706f92b0246cac

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