Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1f5d915424cb88…

MALICIOUS

PDF

46.6 KB Created: 2020-10-16 12:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3331f6153e70396407a6564f37eafa3d SHA-1: 0fad0412e47d929b99cfd847988e908dec057f0b SHA-256: 6a1f5d915424cb88f31bc6a86cfa03bcb2e0cc1ef7f432ee36b5d45f5872a13a
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://ggtraff.ru/123?keyword=hypersonic+android+stereo+for+wagon+r In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f88457c6b83a.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/9093369.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/jizogu.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/949122361a.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/7249692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f88ab7af20f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f875dfbb5355.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/222af2cb-967c-4784-b35c-1a6f1c35b4f2/zeluboteloxagewugesazew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab56de7-4692-4969-bb94-a682b71bc89d/faserazabovedegete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff180bcb-f609-4cb5-ba4f-e2bc2b7b002e/fedatokodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d942b7c-acb3-4901-b1b8-18f9d9df6b19/4355374278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9251/8057/files/justin_martin_duck_dynasty_masters_degree.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5673/4630/files/47541253179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4797/1735/files/30835554524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bc6094-e125-45fd-b8d2-a65515ab1085/23007243421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca9805b-a67e-4e45-95a5-131d988cbb80/sipulakewolareka.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_off000060be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BE 5448 bytes
SHA-256: 67217b26da7b45563c93c9472b11553b542981a92841eeab7b757867d0616c4a
font_01_sfnt_off00007369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7369 10492 bytes
SHA-256: 43e0741d6057446d6e0dc1df9fc5c2390b46404bd2300ca254f8a99d5b89e489
font_02_sfnt_off00009782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9782 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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