Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b4c5c24441750e…

MALICIOUS

PDF

64.4 KB Created: 2020-10-28 15:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 6f3bf3280941ffebb8d498b5b2bffaa8 SHA-1: a83dea561c602f070850295563da311b3ebe696b SHA-256: f7b4c5c24441750effaacf9c9ad8f8905d9f67932ff48db71a8bcd42d91d93b6
214 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=realidades+1+capitulo+5b+answers+page+175 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f8ce0328be51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f925ca8acbd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f87d905a7c17.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/vaxiwurakone-nabita-zemiloxezumur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f8d7d6cc85f3.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/532013.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/damibezivubuv_rewobadojin_viwetegomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8a9dc56654f.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000beae.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000beae.bin)
    • https://uploads.strikinglycdn.com/files/9e394a07-997a-4319-b62e-9f4ddfa22df5/60115339212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b953ee2c-3fa0-421c-936f-20ef08097e28/90237857281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3955/5228/files/17413059729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2caed920-4bf0-4d3f-b1d9-77defa066446/sims_4_wicked_worker_mod_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9177/5654/files/ikea_domsjo_sink_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/39269073999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd38527b-e3ca-479f-902c-9714f6f1fba6/28651323892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1aed83-ed21-4fe0-9a07-ea93952bc86e/soseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/820d9941-d701-4b44-8fd9-185022c27d52/xewilagowakimob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbac8440-bdf2-4c34-bbc1-7db1c287843b/remember_me_sophie_kinsella_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ce79b7-4f38-4fd0-9eda-112c36b41dda/nuzetoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36c4a2f-be10-4b7d-bc7b-1eb044938292/gaxozakof.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 extracted file (font_00_sfnt_off0000beae.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 5736 bytes
SHA-256: 9d66a345fb479302c778fb85ce9d2eece07c5cdaaa424f213b7bb1185a4fe6fc
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 9904 bytes
SHA-256: 94488164c657e4987f86676814a3f2f6444873b845c4ac35ca0d4de05ea5afa3