Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e9fa2514734cc4…

MALICIOUS

PDF

42.7 KB Created: 2020-10-09 01:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9966f72252970e00e7f2a4f124876af2 SHA-1: 641612cddebda97c1397667aebb9373815ee7f31 SHA-256: b3e9fa2514734cc45bb953e135fb57f5cbf423d027bedf36e098ab5fe5aab21f
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://gettraff.ru/strik?keyword=lettre+de+demission+en+anglais+pdf In PDF document text
    • http://files.biomarkerconsult.com/uploads/1/3/2/6/132681030/373fa.pdfIn PDF document text
    • http://xojenijen.goodgirlsgonegrimm.com/uploads/1/3/1/8/131871578/fudagurakub.pdfIn PDF document text
    • http://kamakika.gosmeagles.com/uploads/1/3/1/3/131383483/83a016ce38b527.pdfIn PDF document text
    • http://vepibubi.makeandflourish.co.uk/uploads/1/3/1/6/131606490/9a234534aa080b5.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/b11f4a85-caba-40e1-8e3a-cee38904b568/sivuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282a54f8-0a3f-4fc8-be24-21e2f5e9e5d4/zezoxuvaxopuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81862167-b094-413f-a0ab-d5720906df8d/89287127911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7d37ed-49b2-4f44-8607-95dfc8ecbe12/30347837078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4de66f-256e-4428-8bc4-bb33388fa15d/gozenesikepapepotefik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02daaedf-9b32-4076-94ab-6238bb737fb0/91847830633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a9fb93-8b47-46d9-bd22-5839dca1c3dc/kusafugusu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/0435/4463/files/31365585138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9100/4066/files/63401657671.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_off0000665c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665C 5300 bytes
SHA-256: 4af3b4dfc9cfc1c6de0d65056ae3ecc783c0079dd04dbf04c7a9207cac39a22f
font_01_sfnt_off00007851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7851 11520 bytes
SHA-256: e6f5d5df7f05f366e9b80aabcc6ce90fde52fed66e589223e67135f9c07c8c3f

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