Malicious PDF — malware analysis report

Static analysis result for SHA-256 87823825ac997018…

MALICIOUS

PDF

43.3 KB Created: 2020-10-27 21:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 840e5aa9e50c9a16f34492e382df2c0b SHA-1: 9cb1b107555a9f14dc5f3dc56d01bad67eb0f27a SHA-256: 87823825ac99701828e35ccc91dc70d64d4e4769e9f9c4c73e170107ab413550
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/123?keyword=remote+mouse+full+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f97818dbf5a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f9776165c556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f95fc05ada65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f88cf04c3481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_5f8f59aa4fe01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5f8dacd0796dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5f8d81b643b48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f938a6d7c104.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/nexobe.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/6789685.pdfIn PDF document text
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/xedusogufot.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/mikematuvobejo-jixekajes-zunugogixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f882486e713e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5f968720ba49a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f983f8e6baea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f9379c70ddd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_5f982837127dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f9119bd4ef23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5f8c30f5a92d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6832 5020 bytes
SHA-256: 7317ee65313bf65b27b408aa0caad622d94d17aca0610d79c2163a7820fa3a5f
font_01_sfnt_off00007946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7946 11032 bytes
SHA-256: bc28186a9b5c56ab953ffde07b5d6f92f7de1f7d63fe9d8b510f5569222e0799

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