Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4591dc4e4e6316f…

MALICIOUS

PDF

43.5 KB Created: 2020-10-28 07:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 8dcc07f31b18c2af13170d58298cb5ce SHA-1: baa71bd65a644f69bc85a29067ee5c97efc8d579 SHA-256: b4591dc4e4e6316fd5b3ec449f4ec68dcb03060fd72617176713be5258fb886d
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ttraff.link/123?keyword=minecraft+full+version+apk+0.15.0 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f93c0d3deaec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f87687d36c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f8aa66a5465a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5f9184ca9c82c.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/gaxukegudo-jexipageburujof.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/kamedod.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/difekoresefejojir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8c402d95016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f939599aa137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f883f27c27ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f90d4c383a80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f87d49b348e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000061ab.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000061ab.bin)
    • https://cdn.shopify.com/s/files/1/0484/1016/5416/files/66199399517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3130/5112/files/disney_magic_kingdoms_apk_mod_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9857/4500/files/post_malone_nashville_presale_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/doveguxasinujedimuvumupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2800/4039/files/59692169776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df84827b-5d83-4937-b1ae-82e403047102/molinegudutowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852e5f1f-9115-4125-aa4e-fa6ca3591f3d/latvian_song_festival_san_jose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb90e174-abf4-4e28-b7ca-e0d388b5ea98/concerto_d_aranjuez_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fc0680-a8ce-4889-a1df-be94602fafd9/307598390.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_off000061ab.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AB 5488 bytes
SHA-256: 0d4c3fb8567d4317314bb4bb3fba47d3644eb9d45b164e6fccd723ad23b63ab7
font_01_sfnt_off0000746e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x746E 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_02_sfnt_off00007e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E12 9976 bytes
SHA-256: 10f8946fc31269e3beb09eb6cb92d0d04aac8bda5430345d3912f76642698236