Malicious PDF — malware analysis report

Static analysis result for SHA-256 9585af4555efd58e…

MALICIOUS

PDF

35.3 KB Created: 2020-11-09 16:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 2de2ecb319d0aaa4e2e24925e42fc859 SHA-1: c0f83f39b716632e22ec5b124d8bce7f0cb87fa1 SHA-256: 9585af4555efd58e8fb3b5a9feb8e1e9c2c7ceef855ece4d2c03f74e2b4a1869
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://traffking.ru/123?keyword=describing+waves+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f8d103916540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5f9de32e6af36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_5f93db1ab4f2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f889ae514c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5f9ebbe42e1fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8a008cd60ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f97c28054a5f.pdfIn PDF document text
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/9689822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_5fa7da1c40e6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4872136-e2fa-4a11-ac90-b14d2a4a10bc/77199030783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6015500f-8128-4757-9e64-acf092c2f33c/gezixukavutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5462457c-e59d-4aec-ad05-55ae1f96fbb0/vaio_boot_menu.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_off00004ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD5 5384 bytes
SHA-256: 46da07c53404b244bb68883f13047a3c857f2ace510f6a4162c2791d57bd541d
font_01_sfnt_off00005d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D40 10424 bytes
SHA-256: 03288380053b20ced70c6ee35982f347dcfb25b27dfea57003909466fa10a237