Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4ea2c32be547f2…

MALICIOUS

PDF

41.3 KB Created: 2020-10-26 09:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 535dde8cf858caea119d25272bd8ba21 SHA-1: 2aca12fe625d7c8229261d0ebed4c202043edf1a SHA-256: cf4ea2c32be547f2b70bad0f9dcdd1551002efa85e3379eb884bda8be99ee91f
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/123?keyword=suncast+hose+reel+assembly+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f93090aef78e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f93960cc28c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f8822dde88d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f96699596c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_5f9630fe71790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5f938b79010d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5f9248d856f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f8ecedc10955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f8ca18ad6041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8e11f24cebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f923841a3ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f8e635caefaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f8d73405b17b.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000624d.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000624d.bin)
    • https://cdn.shopify.com/s/files/1/0497/3677/7877/files/3506948535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5789/2506/files/jason_hayes_seal_team.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4157/3022/files/24896921640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3499/1521/files/86177554031.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/6962/9350/files/organizational_perception_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/denyo_welding_generator_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2652/1496/files/movipasikuxonasanal.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/xofavela.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/pases_de_frica_e_suas_capitais.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/bhagavad_gita_quotes_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/pawojaganadifurimebesu.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_off0000624d.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000624d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624D 5384 bytes
SHA-256: 0cd5c0a9655e7c77a2f8b0c94ada573f4ca306424d0789a080ccfa25b6662005
font_01_sfnt_off0000746e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x746E 10148 bytes
SHA-256: cfb65df4b51487a88e25cea44284760e1fa4389dba0e5398d7987601bdda1ff7