Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f47bcdb5ddd148…

MALICIOUS

PDF

37.6 KB Created: 2020-10-16 13:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: eff99ab4c879bf70719bba870eab4fff SHA-1: b3306a670a3085925d2da45430f84c46dd583329 SHA-256: b8f47bcdb5ddd148c226f580252624efdce95607777e680f6869dee06ddea092
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=watch+kill+bill+vol+2+with+subtitles+online+free In PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/575d6950ce6.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/8486151.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/6069273.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/271339.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nipomomuka_gisotufeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f883872171c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f88227a30a27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f874e610bf7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f8830a231dd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f870157dc1a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f8932f878a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f890eb53a22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f8743b2cf2ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f894b4eb22c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f88a8a084dc2.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/e723a346-a999-4f13-ae45-9c1d8fe606a9/bukukarigobelifafujige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6801e03-de98-4ce7-8055-829a82833fdf/karerasaninewepumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6271c8-f0a8-41d2-956d-4fed4f1263b2/7098788625.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_off00005238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5238 5472 bytes
SHA-256: f886b7076876a6585af40845f874bc55ffaa7c8e5334819e48c2919b408b47f6
font_01_sfnt_off000064df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DF 10428 bytes
SHA-256: 8a54cd7873610f569c55a3059a7efda3813d5e6cea6ecc1b03fbd18e1cdf2798

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