Malicious PDF — malware analysis report

Static analysis result for SHA-256 421ba0b365dae420…

MALICIOUS

PDF

43.4 KB Created: 2020-10-29 17:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: fcfa2362753d6c4f4292215f055acfa0 SHA-1: 43e57fe56c9d50c2be08a1535368347b3d3f025b SHA-256: 421ba0b365dae42077ae91896a7cbb9aafc4039ee14bf654d39e327a5817d845
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.club/123?keyword=my+t+fine+pudding In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8a2531e1fbd.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/8264358.pdfIn PDF document text
    • https://zepaxanodufinek.weebly.com/uploads/1/3/4/4/134455649/5816654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5f8d587e5cd98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f8a785165f7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/baixar_para_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/93955486777.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/amadeus_full_movie_download_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6678/8506/files/steam_boiler_operation_and_maintenance.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/83237871942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167e1572-f6b9-47d4-9070-38b3cc8483e8/8929585031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d193a72-64eb-4848-b6da-f98537ee4494/bible_de_jrusalem_tlcharger.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_off000069af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AF 4800 bytes
SHA-256: 62ee78b1723a5d401b5a21a4c6e4e4034c0258c4a939a727ff52bb42cfef0cb1
font_01_sfnt_off00007a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A38 11640 bytes
SHA-256: 477c226bbc0b3c7dafef70faa37daaded290c63c98ab1834d0da6b85c6854f9c