Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef0a84f34c0f46d…

MALICIOUS

PDF

49.0 KB Created: 2020-10-02 11:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 52b7af72f90f458dc4431dcf60671b44 SHA-1: b5dbbe33581321e0fe3ec96476264232ba6b8e9d SHA-256: bef0a84f34c0f46ddf558ec22e1f4e2e865cfb9af8c281de48a80a80931b2e72
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://cctraff.ru/strik?keyword=nclex+reviewer+pdf+free+download In PDF document text
    • http://files.bradyscustomwoodcraft.com/uploads/1/3/1/4/131437924/zifezepupovivosa.pdfIn PDF document text
    • http://files.theprincesscryaries.com/uploads/1/3/1/6/131636930/7080587.pdfIn PDF document text
    • http://files.cambridgeburlesque.co.uk/uploads/1/3/1/6/131606492/sasaxiv.pdfIn PDF document text
    • http://files.thsprojectlead.com/uploads/1/3/1/3/131383747/pezawafojo_tidopokiduniti_nubawata_kaxulukibefeje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1664/0917/files/earth_science_reference_table_workbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1453/9432/files/pegumumiwesipawagexabefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4007/7974/files/49382752623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9096/7714/files/is_happy_wheels_shutting_down_in_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7524/2650/files/disadvantages_of_hydroelectric_energy_to_the_environment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6cbe52-e972-4121-ba5c-613490ca4b86/xilogisesejojepoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43bf31d5-0992-448c-80df-97538e462caa/52158383788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339acded-ea3e-44c3-babc-6daa03063cd3/90034328957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cd2d84-895b-4cc0-9d0a-1c796a47094d/49324428096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470ba99a-f1e5-424d-b104-52fd357b62cd/35502491664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e606593-e53b-4bf9-962b-391b166adc04/16356688094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7550e6e0-e690-442f-a171-a6905e5f3189/75623205134.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_off00008119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8119 5160 bytes
SHA-256: 2d9b74c3f2c06b6ebc74a389ef7e60b83f20f6877e71f11c475d7bd10226f9bf
font_01_sfnt_off000092d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D8 10564 bytes
SHA-256: ae7d5e092cac57f5179332422852239788dc1ef4bd98c311c4ce983befcfc838

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