Malicious PDF — malware analysis report

Static analysis result for SHA-256 162e38ef53333a88…

MALICIOUS

PDF

41.4 KB Created: 2020-10-02 11:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4b1ba89046b17a43e398aa3f548537d0 SHA-1: 317fa75dd36ead0f95fc49b258960b48f07deb64 SHA-256: 162e38ef53333a880d3001b93c7ab141c1366fcd7ed0568c4677a191e0ca4114
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/pify?keyword=distressed+wood+letters+hobby+lobby In PDF document text
    • http://kamot.joyingrief.com/uploads/1/3/1/8/131856543/12db1.pdfIn PDF document text
    • http://files.ashlandeducationfund.org/uploads/1/3/1/8/131857465/zudotuze.pdfIn PDF document text
    • http://files.truelovebulldogs.com/uploads/1/3/0/9/130969717/0767ba6234d8bbc.pdfIn PDF document text
    • http://files.wallingtonanimalrescue.com/uploads/1/3/1/1/131164556/5388895.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/012af77d-e1a6-47a7-b588-c25464392e8f/33397597921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac399ef1-0fdb-4299-8fb8-8076cc9611bc/6427540843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a52b96-3fd9-4d49-b190-32fccbda3744/rasenisapasevakapike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c41872-caa3-423d-834a-78e6df0644ad/5696321814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdd7066-e250-4f68-b773-ecc2757d5a39/82214561222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7721becb-e950-4998-8360-b23d8f82d310/79159002540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd5e5f2-546c-4a43-9538-9f9db952d6e1/47350231407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c9ed5a-fdf4-445a-9716-c88dcf581c40/bovegujigagekizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a2191b-6c50-41a1-a010-c8476f97fc96/nojuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1225aee-a692-4164-b1d0-ea9efdab8163/37298828799.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_off00006491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 5036 bytes
SHA-256: 417b4d99f24a0bcc9791786efd72a170a719a33a709ccfdb2be69325826b031b
font_01_sfnt_off000075c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C0 10160 bytes
SHA-256: e042a1c0d744d839f515f7fb6eedc3ed40d0d81147ba4a726128458e68673e18

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