Malicious PDF — malware analysis report

Static analysis result for SHA-256 912f257ccb684d2e…

MALICIOUS

PDF

50.4 KB Created: 2020-09-30 19:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 9b5789e3abf65b795585cee2436924aa SHA-1: 6f8db85f3c5e80c844885a163814d00bf116d6c6 SHA-256: 912f257ccb684d2ef3c437290f93acd632def6037eb50abadb6725b33a8599b0
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://gettraff.ru/strik?keyword=advertising+and+sales+promotion+management+notes+pdf In PDF document text
    • http://files.aukidesigns.com/uploads/1/3/2/7/132740700/2283441.pdfIn PDF document text
    • https://site-1037085.mozfiles.com/files/1037085/41551776635.pdfIn PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/33194247674.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/vimivobadezudo.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/vabotumibidalul.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/4f4c9538-0a36-48f0-af1d-204ed36c76a6/81523098955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93ba740-2325-4e7b-b55d-a77f0a2c0591/85041335773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46c161d-7006-4d74-987b-6e525ca7cbb7/84676884807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4e9d0d-fb07-41c1-9488-5f914feed5df/4639095918.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_off0000879e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879E 5412 bytes
SHA-256: 24c3b817fb92fb1f8b3aebf8dda742c2ac83d63969405a42cc1f19168b012c05
font_01_sfnt_off000099fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99FA 10340 bytes
SHA-256: df6fb05493878675bded9781efa2b12fa3b5f71d9c6f95053b7c2cf35deb7f35