Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c848533e123e25…

MALICIOUS

PDF

42.7 KB Created: 2020-11-01 21:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b51107961342f49aa8018b70a5e4537d SHA-1: 40b91cdb5ebbaabb0e847155c044b4d0920204c4 SHA-256: b1c848533e123e25370ce511792bb8b1b2140cda966d075bc052b6a2cb7dd8e2
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://ttraff.club/123?keyword=west+delaware+girls+basketball+schedule In PDF document text
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/nogezanop.pdfIn PDF document text
    • https://vepewose.weebly.com/uploads/1/3/4/4/134486620/gurojunenuzox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/acupuncture_handbook_point_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/razesaziro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113772a7-4c69-4bb4-bbfc-842036a99a4c/favujokolegero.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/oregon_lemon_law_used_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9ac887-7a60-447f-9e6d-35cd0f449ac7/visafulakipevuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae407b8-33de-40df-8e9e-7c8c07ea9544/vusun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9adc936c-4eca-4d47-be58-33be615fbb85/minecraft_adventure_map_modpacks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11007ee-385e-4043-9e34-7fc5fd95368b/xaxakuwigalodujejujofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fcba25-3680-4bf4-970d-7b3e0cb62365/one_piece_stampede_watch_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3251e74d-3ef5-4edd-be5b-270314d78330/19869851902.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ABF 5508 bytes
SHA-256: 02bbc3ee73c5ad23b0f83782c0e2d2693d3b4c1275eb55828f082fc4ff2840ff
font_01_sfnt_off00005d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 10588 bytes
SHA-256: 825d6ec0c875bdadfb4cd92d4a4ebdb12deb45ee43741cd7d92f5520a603ee7f
font_02_sfnt_off00008207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8207 17980 bytes
SHA-256: ca77e0bbb572e2799c011d1efbaa52fca1448f99fd7805d42b59123a2ace0e90

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