Malicious PDF — malware analysis report

Static analysis result for SHA-256 33755273a1c3bbd9…

MALICIOUS

PDF

34.9 KB Created: 2020-10-12 09:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a2ab62c50c288c0566be3ba5273dd43e SHA-1: 69035e70a9070cab278adcf28298fdc57fc72f44 SHA-256: 33755273a1c3bbd9ee7f814f3f07006b5a7ba3a2e67dee79afb1ac7a5813a5d0
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/strik?keyword=avrupa+tarihinden+kesitler+pdf In PDF document text
    • http://files.nssdoctors.com/uploads/1/3/2/6/132682171/doforubofol.pdfIn PDF document text
    • http://files.todos-juntos.net/uploads/1/3/0/7/130739344/rifim.pdfIn PDF document text
    • http://files.kisdo.org/uploads/1/3/1/4/131406811/6221233.pdfIn PDF document text
    • http://files.stpatscentreforward.com/uploads/1/3/2/6/132682905/c533790d0a5b.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/c4489497-a93d-45c0-b0d4-8b15b89735b0/demitunepimimemufosibex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2958b6-de97-4171-9d6f-4b293cb60e96/90264253234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1e6146-6acf-4595-9aa1-f2b7f6de3bb9/morujedozeberoredolut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd897d3a-e2d4-41c0-a6dc-9003e8310aff/99421818050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5e3a09-2a16-41fd-97e7-bd5d5a40f3a3/rapegeliwan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0712/5921/files/33700024722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/gisobujewari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/round_expanding_table_mechanism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2808/6436/files/pixuxariwujum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4334/4543/files/zovokemusepafometanixigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5067/1514/files/flood_route_26_attack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/jasimoko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/book_poster_project_ideas.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_off00004945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4945 5244 bytes
SHA-256: 35172bb4231a3f04028ad6eef15da0506ad891a2e9c937f2488a1920c0109e6f
font_01_sfnt_off00005b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1C 10436 bytes
SHA-256: 0b3863c9d1b5d60ba0a277178367501d585eba5960655930ab39227cf30152c7

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