Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff93432b7289680…

MALICIOUS

PDF

41.5 KB Created: 2020-10-02 01:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: af67b0b70980eddc2054130ea994b517 SHA-1: 2f649bf4f70470223b4a1e5471673ce017255f5d SHA-256: 3ff93432b728968089d2d449abf48b801f7e1faa64572bc05e0c96afa47f5bb2
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=aquelarre+dracs+pdf In PDF document text
    • http://files.steinhausbernese.com/uploads/1/3/1/0/131071063/8625808.pdfIn PDF document text
    • http://files.brcwrt.com/uploads/1/3/1/4/131409090/1113484.pdfIn PDF document text
    • http://files.beastchoirs.com/uploads/1/3/1/8/131871710/ladeko-wiliwi.pdfIn PDF document text
    • https://site-1039438.mozfiles.com/files/1039438/6091420615.pdfIn PDF document text
    • https://site-1038391.mozfiles.com/files/1038391/65700653079.pdfIn PDF document text
    • https://site-1038416.mozfiles.com/files/1038416/75320370006.pdfIn PDF document text
    • https://site-1036982.mozfiles.com/files/1036982/99554543629.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/37975965596.pdfIn PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/61824478131.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/zopajigonawudoposijibu.pdfIn PDF document text
    • https://site-1037130.mozfiles.com/files/1037130/91840636626.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/1/0485/2200/2587/files/the_escapists_xbox_one_crafting_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7105/7319/files/ice_staff_code_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7914/3076/files/810_bus_schedule_to_menlo_park_mall.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9329/9878/files/vujabavesud.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_off0000649d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649D 5264 bytes
SHA-256: 33713e65a5cb6e336fa0b9a0ac0c28f0b6a2aa4aa566b395080bb21b15435e36
font_01_sfnt_off00007693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7693 10224 bytes
SHA-256: 91cbc4cbfbcadf04010b015506fb83c23ba2478bb2d2dd126d82581812ed7ce8

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