Malicious PDF — malware analysis report

Static analysis result for SHA-256 a576ad1075bf9d90…

MALICIOUS

PDF

42.6 KB Created: 2020-10-06 17:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2707a0cbfa44390e9a66fcc0f5b3f90a SHA-1: eb48f04dcbef5b65ec24ea31aad757652885bfe4 SHA-256: a576ad1075bf9d90ef28692d8c99493fc3831a0dfb7c99f5c7fabf84db5725b0
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/pify?keyword=best+prom+ever+sparta+mi+2019 In PDF document text
    • http://nizurir.sdstudiovivo.com/uploads/1/3/1/4/131453109/xaziluferosapebuk.pdfIn PDF document text
    • http://files.shelleyburgoyne.co.uk/uploads/1/3/1/6/131607712/f58f40059eadeab.pdfIn PDF document text
    • http://files.crownukmission.org/uploads/1/3/0/9/130969172/936d5398c6.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/36551337816.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/luzokaxaziwun.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/169d5f6a-fef1-4f3a-891b-33afdb73ad73/27910144409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f737ee9c-2baf-4653-8e20-94e53821caa8/sabupakemifavetovisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc7d5aa-19f5-4f0e-b5c7-55d674f525a9/34415793323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7534cf51-14c4-473d-9840-52b8266bda61/59857689822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8bfd30b-682f-49aa-867b-4cb4ce22b0e3/junurogagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e15f8c1-c696-476c-b809-f6e44ab4d4bc/24738778664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1caa91b3-926a-48af-a0fb-b5a26a55f779/24724674821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a8c1ad-3a91-494f-8835-8fb515619045/86135895087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6901e43b-5bfa-4e98-9379-a23010d7d3dc/35441133448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52772c73-8505-4ce4-a52a-df7d373a4ae6/pimurogedirili.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_off000068a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A8 5524 bytes
SHA-256: 395d8806d8de10e888606a2d74325afbff0ef07b288152f8cfc5ef6ad54df161
font_01_sfnt_off00007b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B60 9848 bytes
SHA-256: 2744b11d4efc17c37e3b6fe4fd2a70dda42d78283729b04060cc4eb29e9ddc9a

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