Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fa558628b2cbe6…

MALICIOUS

PDF

51.3 KB Created: 2020-10-05 18:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3c612bea22e2fe80fcb0a4486a8879e8 SHA-1: a62e58686b39e03ebcfaba66a6befa343ff1351c SHA-256: 65fa558628b2cbe6d3aea61636a9fd6b6d2ecc14490161f070485acb4b5accfd
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=iit+mathematics+books+pdf+free In PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/79058117230.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/26832595046.pdfIn PDF document text
    • https://site-1041084.mozfiles.com/files/1041084/67280905786.pdfIn PDF document text
    • http://files.johndeasytd.com/uploads/1/3/1/4/131407572/8646938.pdfIn PDF document text
    • http://files.stmaryslee.org/uploads/1/3/1/4/131437669/9090346.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/9e6ec7bb-2cd3-4b46-bfc5-203126f44a94/70244932781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f843fc30-c6d2-49f9-adfa-2ca1f2c3a1ff/27797108072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd30b26-77bc-4e4f-8171-43c70456ab4b/moxawifazujiwamepaxunod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f354b9-cc61-4dec-a29c-9f61363669b8/lafevosomawuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3690/4090/files/super_mario_galaxy_2_life_cheat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7798/3651/files/ruxavekirokebijalusabuvor.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_off00006b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B84 5504 bytes
SHA-256: e8373597885b77ad8dc32f7f736e1a5c5430cdda783659d8da6ee56b9d2b213e
font_01_sfnt_off00007e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0B 14692 bytes
SHA-256: a6e1c46e316dd712e2b71fa2bdaffa7f40b03e9e3437a5a2ed9fd66f12d33b6f
font_02_sfnt_off0000ab38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB38 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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