Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca38c5ecc7d21754…

MALICIOUS

PDF

42.3 KB Created: 2020-10-31 19:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: af1537093f905e70e35a24ec03b0f62c SHA-1: 6af1c7ef937d16b81d772b6a3f7da773c4c2aefd SHA-256: ca38c5ecc7d217547debb5b507a84f377e854657eb6d333874c8cd21386f45b3
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=journey+of+the+gods In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f8a4047bcf39.pdfIn PDF document text
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/xoluvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5f8b66540d32a.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/2105481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5f9770c6de468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f98986cbd4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f87438e0d2b0.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/1/0502/1859/8558/files/gofalemov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74794ee-1e27-4dc5-8269-5ebe70c0213a/65600223841.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_off00006719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6719 5016 bytes
SHA-256: 96bc08ad838cb1ef4855b2c067a2c62e833f5f9ced0a29ca264d2f99c82657e3
font_01_sfnt_off0000782f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782F 10828 bytes
SHA-256: 5379881a88fc5700337bba1bf7662fa09a7612a0c46185d25d9e843e93af49aa