Malicious PDF — malware analysis report

Static analysis result for SHA-256 36994aea27d758c1…

MALICIOUS

PDF

40.6 KB Created: 2020-10-01 13:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c2308ebca73a8b1077aeedb3a68222cb SHA-1: bd77cfec05b67c7002e45067cf1c0361512cb51f SHA-256: 36994aea27d758c1045810beeb74b8408392cec24a82a3dd6b7eb4b771a81386
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/strik?keyword=english+grammar+test+book+pdf In PDF document text
    • http://dizudiril.timberlynfarms.com/uploads/1/3/2/6/132695384/3610bf4905ed.pdfIn PDF document text
    • http://woxuxuri.lunacatfluencer.com/uploads/1/3/1/4/131438641/1320541.pdfIn PDF document text
    • http://files.cockburnarchitecture.co.uk/uploads/1/3/1/8/131856195/kukuvadumonododoso.pdfIn PDF document text
    • http://files.devinreimer.com/uploads/1/3/0/7/130740174/9f5612c.pdfIn PDF document text
    • http://pegope.downbeatmusiclab.com/uploads/1/3/1/0/131070305/795673610c06d.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/bdb1dc3a-f340-40a7-bb9d-056b45c4d20c/lepaseburikabopovokutav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb227e9-e2ff-46b1-9d5a-36a117b2ff70/30014480897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0df7af7-9eb9-4b82-8297-2191d014c9f9/fodumilipota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b1a7a8-d3ae-42ee-b27c-eef4bdfbe412/rinitafusivazute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/medidas_de_cancha_de_voleibol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4392/5661/files/sequential_bilingualism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/8658779090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0106/0262/files/30860271040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/8014/0950/files/the_fifth_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef860f7-6c60-4ddc-a6cb-3d1aceff6dc3/97684292676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7046d9c6-b127-4c27-9f88-e88e4798cb1f/muginumesekepuvari.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_off000060e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 5616 bytes
SHA-256: 7014ee13d796308ee768218cf0ef9b85999f300348c2223c7cb210eed658a2f9
font_01_sfnt_off000073cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73CF 9952 bytes
SHA-256: e60cfaab4fd698d3e65ce5ada6f6087e926cce3e7f09217366e254185cf95322

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