Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b576e22c71ae19b…

MALICIOUS

PDF

40.3 KB Created: 2020-10-18 08:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3717cd1fb846f17da32ec1e1442424e2 SHA-1: 2317176d9e4de74291cc9a98608b18265b015e39 SHA-256: 8b576e22c71ae19b2e278d2d7fb56fb6fc4bbd1769e65d96310114d70aa6a5fb
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://ttraff.cc/123?keyword=xlsx+to+pdf+ipad In PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/nafikekopajime.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/3338180.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/195b07539e966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8aa33c4a955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8aa83b79bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f875988df0eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5f88a4c299773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f87e5ed88e74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f87d7db2b4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8bc288356ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f8b78982d263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f88981be4cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f86f82669236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f89c985df25b.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/9c465bbd-3951-4818-be7c-b13355f22329/xesulikibewupetawaborep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6935768a-9b5a-47dd-a145-8d83cb412f8c/xiwavanejobofom.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_off00006030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6030 4984 bytes
SHA-256: ae89e2b622b1d3df8157f41306f2be992f87d4aec075838012801014177e26ca
font_01_sfnt_off00007135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7135 10660 bytes
SHA-256: e95becba504efdb116dce7f6301d5197a58207a7a9f463fd27dff03d483f9b6e

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