Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a451cbba9d4165a…

MALICIOUS

PDF

56.5 KB Created: 2020-10-03 09:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 024f0c3fbbd6ee1268b783c5772f53cf SHA-1: 7d1eced7e303e391abf38d27ab202abfb8e40235 SHA-256: 5a451cbba9d4165a87cf3b88b919d60628a7af9a2ff33fa9dea8e66acd74e98b
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/strik?keyword=context+clues+pdf+with+answers In PDF document text
    • http://xoporo.ahealinghand.net/uploads/1/3/0/7/130738837/vuvizesezalon.pdfIn PDF document text
    • http://files.ragazzedellovest.com/uploads/1/3/1/0/131069766/bapiwadosunenivu.pdfIn PDF document text
    • http://files.trekkerprise.com/uploads/1/3/1/1/131164156/dajoseporadoredem.pdfIn PDF document text
    • http://sudiwal.lucylawrie.com/uploads/1/3/0/7/130775075/f78d3bdb.pdfIn PDF document text
    • http://zemavowa.oaklandmillsonline.com/uploads/1/3/0/7/130776436/4f002fed58.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/1a8edc16-34f5-44fb-91fe-f73cbd9b0f0d/laxafikela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4589517f-9b0a-4beb-9937-7aa510b0da91/diganopularolubaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fdec6c-8be0-47aa-8b8d-2615f2075f08/fiwulivovadabajebizus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766ecc7f-cc2e-43fa-81ee-f55c2082040c/vipinexubelazumipasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6970/1280/files/41766223550.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9004/3814/files/electrical_inspection_manual_2014_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/bumekegefokeluxiwofut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1034/2563/files/9530654731.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/paladin_deities_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/anime_how_not_to_summon_a_demon_lord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2866/7816/files/dipotidepurezigin.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_off0000a01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA01A 5308 bytes
SHA-256: 2cc0d8da7a963db3e0004045edffa1bc68829e06fe6d354fddcdb044b5392e44
font_01_sfnt_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 10140 bytes
SHA-256: 24983ff29b2f28c3100e0c512c8bec34c7831fda1153647695ae0a3f0e311c76

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