Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52819a668a89e2e…

MALICIOUS

PDF

58.7 KB Created: 2020-10-29 16:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 1a7e31b7bb4d1ce694d59fd4a9a5a159 SHA-1: f551a6b3956efdb84005d1bb2db792a39cc627e7 SHA-256: e52819a668a89e2e803d2854ddbbe0fa8e82009bd052f8c3fa802b74852249d6
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://cctraff.ru/pify?keyword=will+durant+free+ebooks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f894eb7c57e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f8f4938b2cf1.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/07278d13-f130-4c34-af4e-f34412f1a1c6/14209649819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8330c73d-a4c4-4e6a-bf5f-1d8a2cd45cdb/5568519517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b1d3e2-d7a3-4fe0-859c-53cf52f320fe/janapukujifolamobitivejej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723defa2-e5f3-4743-a6ef-a572ef5ff366/30266994656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c2a7ac-1ee7-4afc-a383-8a54bfb410b2/jorujupetitote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2133/5189/files/48753035931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce15f6b-580a-4f0d-9f06-a9ff2a8755cc/suwitomudojabedalewod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6670/2018/files/tirolufutubokevewuzigoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8583d36-eb89-4bdd-9c64-c835632f61d9/didactica_de_las_matematicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215dab91-ff46-42c2-af2c-bf6a3d9533ee/kel_tec_9mm_rifle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889a770d-dd59-4102-ad24-bbd9e37494e9/30207891074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a47406-9630-4865-b99c-318a92fec44d/the_lost_ways.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb08626-0716-4531-b3b2-49e409b5467b/jazedolunutemiwagoxi.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_off0000a7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A7 5120 bytes
SHA-256: 1063670b0feca881b817aec5458646cd0a5b8c636bff287d05d6eedd55927088
font_01_sfnt_off0000b92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92E 10748 bytes
SHA-256: fef7a926a6bd70dd27cae9895d4cf58fbcded7468a980b5fd3267b14e6dbc357

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