Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b56ca70145e198…

MALICIOUS

PDF

47.4 KB Created: 2020-10-12 13:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 81f1165be927c7f0a277a5bdf634ca01 SHA-1: ed524b7e0f703afaadbca2db402eb912bb9dc84a SHA-256: 90b56ca70145e198e347b11c66345009a3083b79c77f705e2be460652ac31040
182 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gravity+rider+mod+apk+1.15.24 In PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/gegosu.pdfIn PDF document text
    • https://site-1038478.mozfiles.com/files/1038478/xewudoleforokozigajeto.pdfIn PDF document text
    • https://site-1043802.mozfiles.com/files/1043802/lufomolevudojelekeko.pdfIn PDF document text
    • http://files.vandaliachurchofgod.org/uploads/1/3/2/6/132696067/wogadobozavopajunen.pdfIn PDF document text
    • http://files.cantonohiolandscaping.com/uploads/1/3/1/4/131453651/453c43f3.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/1/0483/2513/2452/files/53964193538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1594/9466/files/impossible_quiz_2_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7952/3240/files/single_replacement_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9493/2640/files/the_windmills_of_your_mind_movie.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6416 5580 bytes
SHA-256: 0bceb528d3e6c5254c3f40c51608c0dc815edab67b2208dcc1eb235a5a5fb04e
font_01_sfnt_off00007730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7730 10616 bytes
SHA-256: 5e2ee909db687985d40c00e80d7b8c1219108095d7146bf7a5cc7f1adbf1ba80
font_02_sfnt_off00009bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAC 16256 bytes
SHA-256: 4f79b565ad91846ac57125684cbeaf6b3ed458a8f664935fa5b24f711e4a36c8