Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c37100bddb3777e…

MALICIOUS

PDF

40.9 KB Created: 2020-10-17 06:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: bb9364c5a44a7173da5847d60f825666 SHA-1: 1266fa37b3e84608074665f06d3c1733d34e4925 SHA-256: 9c37100bddb3777ef008ce11ecfdcd85b7d80ea9768ed6c84fa55b950538fc8a
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=cupid%2527s+chocolate+season+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f87737924610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5f88998831ac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f88257c3c892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f8a6201c31dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f875d3e267e6.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/1/0483/8155/8933/files/wii_u_wup_games_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0156/3304/files/fijokenozosikawibuzav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4869/2631/files/43931742437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4510/5045/files/hanzo_the_razor_sword_of_justice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3591/3123/files/new_milford_library_nj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7645/5066/files/adams_county_recorder_ohio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5460/2658/files/35328762035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/2660/3942/files/vivo_launcher_apk_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d36f07-b23e-4145-beec-799d81c40aaf/9772650707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a87222a-af21-4383-b9bf-f4e81494c8de/85749868815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400aaa16-325a-42b0-b0f3-2c3b82d56979/51684512122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7c3537-75b5-4363-a580-f92f99979ec1/tusirusolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7b3a22-768d-4b09-9d04-d37b6d542f3a/dirazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47df9c61-aeef-4340-8e84-bacf556c224f/nunetumaluxajigib.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_off00006216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6216 5136 bytes
SHA-256: 968e9880616a62c0078724f3466cf47000d21cff7d55a250a0ad50cb1e2903cf
font_01_sfnt_off00007391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7391 10128 bytes
SHA-256: 72894445ea7d341e0f32b912070151006b3faf88d9b53bd157d7b99c89d25099

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