Malicious PDF — malware analysis report

Static analysis result for SHA-256 040d281d6cf7b7bd…

MALICIOUS

PDF

44.5 KB Created: 2020-10-15 23:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1dd9e70a38177b394fba9cdbad84a01b SHA-1: 22262845369f499886004744021b7b3bb19f2959 SHA-256: 040d281d6cf7b7bdd9953929356caeb4f74f39d9e4e51d8ca334a6a7a1cddbd4
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/123?keyword=test+taking+vocabulary+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f87eba9d612e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f8806bbd25ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f8774ecd74bd.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/9855210.pdfIn PDF document text
    • https://sonilotosoj.weebly.com/uploads/1/3/1/3/131379329/jigekuzileketed.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/9400458.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/9325561.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/1/0437/3698/9850/files/43827726825.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3513/9482/files/kringla_bakeri_og_kafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7408/5572/files/blackmart_alpha_apk_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1072d1b-8b7a-45b8-835c-a117f5cf6e5e/86860644312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab81f43e-5ca2-400b-b241-2deb34b3c097/wimij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a9444d-967f-4311-a005-9b3c002f032c/datufebavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd031af1-5696-4968-9b5f-f54ba1ecaa61/49234377378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8508/2008/files/punapotoganib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6031/2232/files/user_manual_for_power_pressure_cooker_xl.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_off00006eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 5468 bytes
SHA-256: 82d4cb68d4aa7f03a35f1e8c86c29cd44d76114b8ad7a4e8909f23a6fe703bc6
font_01_sfnt_off0000815c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x815C 10280 bytes
SHA-256: acde9a5680a6012259dd7e15d8034ba520a3b763a98b84269cd0248ba7c5cf3f

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