Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e4dffa71ab9157…

MALICIOUS

PDF

39.4 KB Created: 2020-10-30 12:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: c00764191abbdc23209ebcc4e6d82739 SHA-1: 6abe5cc5415a6c948b7a9d78ef5fe17109de3390 SHA-256: 92e4dffa71ab9157a1c34b81a4bb78fa1910a9f73ec0f301123390f4d4b964f7
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/strik?keyword=esq+swiss+watch+repair In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_5f954f31e0152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f8eadd1cb67d.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/9fa45db5-fbe0-4e99-89d4-e3a1661fd1e4/shri_ram_janki_mp3_dj_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ecc7a5a-7b50-4dbf-a539-e30b31bbb182/76591234729.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3594/0793/files/50488533866.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/musabegalokafatep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067777a9-14a8-4d7b-9abb-60f0e444efc9/384674713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed86eba-22a6-4b13-a270-722bdc1942c3/understanding_nutrition_14th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56328e2-5f3e-4f87-b1c0-2f0c0e292314/4113147246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816b5966-4b52-4f1d-aad8-884990a0de02/40375458915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e71a96-5f42-4378-9e90-bfb56cd50ae6/wanonefigava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3777/5810/files/88928072348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703276fe-9578-4b39-8ed7-bf124dc3ed99/17855085187.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_off00005a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2B 5164 bytes
SHA-256: 93d7f1ef12da47acaa06225b8cdcec2793487ec7d12c3c972f76c4ecaa1b301d
font_01_sfnt_off00006bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD3 10832 bytes
SHA-256: 48c9b731f4bce918230f4c88ed9706c9546ebc26526a23e7de676f8cbfd332eb

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