Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e273b2a129d32f…

MALICIOUS

PDF

42.0 KB Created: 2020-10-10 23:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8162ac9241237578468a6c0d4e86fbb1 SHA-1: e4f9d26e059e46381abdf1d8e56432f934cb60be SHA-256: 87e273b2a129d32ff4ab7e0a0858fcbd6170d566efab4dd5f20cc43192cfcb06
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/pify?keyword=paper+mario+pro+mode+guide In PDF document text
    • http://files.lmican.com/uploads/1/3/2/6/132681863/d0d6c352a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/29847370872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5849/1303/files/friends_of_camp_turrell.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6303/0172/files/how_to_convert_vertex_form_to_standard_form_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/human_environment_interaction_in_rome_italy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0976/8604/files/80259105245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f095d1d2-e6b8-42e4-ba68-e8e742cd5cff/40951916038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6760a4a-6b1e-455b-954c-7e35dfa8dde7/29953545780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbeac93a-5b0e-4fad-a2b2-b2e8f05023b2/givutofezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e991f9a6-db99-41f4-bc31-2dca777e076a/zeveguxevoxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e18ddb4-9b78-402f-9efa-2e1d8e828a95/kunuvig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b80f785e-b16f-4a10-b5ba-aa57223de46e/4665887230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d132d9-ab60-4c1a-85d9-3f95ae0225c3/59345694805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4497849d-662f-4115-a065-af1080d225e5/potojar.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_off0000645c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 5072 bytes
SHA-256: eeeb944d1fb051248f6ee866ef95fd321e09843a1dfb5623eabcdc4fc2df1766
font_01_sfnt_off00007581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7581 10996 bytes
SHA-256: fe92ee91b3f0b96275f93afd27706496c8a165b53a37f17a14caabaad4da39ab

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