Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b18b71c7082cf9…

MALICIOUS

PDF

43.0 KB Created: 2020-11-04 00:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: b5c1ac47ec1b84ab85346b8e5ba8d6ee SHA-1: bcf25232953343d5fa8a6d2d14832ffa0134bf3d SHA-256: c4b18b71c7082cf9653b0273940167bb04b207f06a308a86758b346f611951cc
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/aws?keyword=marketing+101+final+exam+study+guide In PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/2408f2b95212.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/sogejaxini.pdfIn PDF document text
    • https://nixejinalir.weebly.com/uploads/1/3/4/3/134321479/6d888.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/nevazaxomuz.pdfIn PDF document text
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/gujuxupo.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000691c.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000691c.bin)
    • https://s3.amazonaws.com/susopuzupure/catalogo_ikea_2018_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/dimash_vocal_range_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38bcb2b-a999-43e8-a220-a14160e9476e/fifapiwatedirupu.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/73599413231.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/rinozinuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/87495562461.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/2829321469.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 extracted file (font_00_sfnt_off0000691c.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000691c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691C 5660 bytes
SHA-256: 2025a4502832b31fb2ed8609b94b491c4da1a99fb9ef3a706837ed9fcf38b656
font_01_sfnt_off00007c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C75 10356 bytes
SHA-256: 2a7ecf6919ea2c2a3322247dc686874b77b1472819ef008a14f0d0d586b12843