Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe8303355cb606f…

MALICIOUS

PDF

52.6 KB Created: 2020-10-10 13:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e6df521a3a8e457c77d3ad8c03bb274b SHA-1: be793c7a00d4e3ac5a3f91017e37e0f46fd7dffc SHA-256: dfe8303355cb606f7ebbe11d2d97522e0a3457b28618267c85275269450cedd0
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=lin%25C3%25A9ariser+sin%255E+5 In PDF document text
    • http://files.creativemaking.org/uploads/1/3/1/8/131871740/fimifonozabopom.pdfIn PDF document text
    • http://files.im4sound.com/uploads/1/3/0/8/130874253/milawixiwekomidefako.pdfIn PDF document text
    • http://jarejozeb.natsredwoodempire.org/uploads/1/3/0/7/130738667/7432a6a06500.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/20306719031.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/90459369564.pdfIn PDF document text
    • https://site-1048226.mozfiles.com/files/1048226/8045104741.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/1/0429/2853/7753/files/binogeda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5708/1251/files/elk_range_in_kentucky.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/0243/6245/files/naxaxomakatifudimubixekul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3319/8498/files/organic_chemistry_carey_solutions_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8300/1756/files/causes_and_effects_of_imperialism_in_japan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be31de9b-ba4f-474b-97fa-208d8da4da65/xozig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961a61a4-65f2-4ea5-97fc-f96a82a607ec/paximutififoduge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe925234-e059-4958-8cf1-79da841d437e/26403450187.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_off00008c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C85 4904 bytes
SHA-256: 0647e0b8e6932ada9f5b6bf07c420f022187a38aab7ff0c14cef810a2051fa10
font_01_sfnt_off00009d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D03 12472 bytes
SHA-256: 2480f2efe885c9e040fb83e9e35f5bd3e6c1f3807050b6341fd3aeba71b11c68

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