Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90f74b4b7398688…

MALICIOUS

PDF

44.3 KB Created: 2020-11-01 16:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7a1d4d307287e20c32a743098151ca68 SHA-1: 0637ea4816ca3c115b29051a427defacf96ddec1 SHA-256: c90f74b4b7398688268826ac126f6b65455c028d90c33f4f1703ba090dbb65c4
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://ttraff.me/123?keyword=bruce+springsteen+setlist+1984 In PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/8018732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_5f8eeb2b645f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f91ad72a9452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5f95b61b55b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f8d953e87c74.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/1/0436/6509/6857/files/ensnaring_strike_5e_ranged.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7290/0264/files/50711140876.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/34245808926.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/68526254615.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/the_periodic_table_of_elements.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/smith_and_wesson_mp_9mm_manual_safety.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_off00004cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF4 5432 bytes
SHA-256: 014f4eb5504ed6019c53e2b76d0c11265ad8e526d5069177727f049efade7e42
font_01_sfnt_off00005f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8F 14600 bytes
SHA-256: 6a027d2219f74f92d31f831afeee7d9ef656a42093f527be5ea6a692cdb05f40
font_02_sfnt_off00008cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF3 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15