Malicious PDF — malware analysis report

Static analysis result for SHA-256 740c1df377ef2854…

MALICIOUS

PDF

41.6 KB Created: 2020-10-08 16:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 427d6bfed25fd186b8171d1d093eefc0 SHA-1: 8f5555a6bed9bbb7284cb1eda932da288349dd37 SHA-256: 740c1df377ef2854a2e2adee26375ef16697b84a96f85f9b1cdef2eed72ef887
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/strik?keyword=witcher+3+status+effects In PDF document text
    • http://xidif.otiesummerschool.com/uploads/1/3/0/7/130739607/9002622.pdfIn PDF document text
    • http://jamaj.theopenbus.com/uploads/1/3/2/6/132683138/vamusedejagi.pdfIn PDF document text
    • http://files.nhsaofamerica.org/uploads/1/3/0/7/130739362/satezetef.pdfIn PDF document text
    • https://site-1037864.mozfiles.com/files/1037864/xudozazil.pdfIn PDF document text
    • https://site-1038429.mozfiles.com/files/1038429/gibalapedekipuja.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/d1d681fb-5ac5-4fef-b53c-1ee9acaebd9d/15560838541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b531247d-97ce-4126-bd50-f4dfe4448842/kevegupumoxefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d44acb-d344-44e7-8768-a457901ec06e/guzunupelebasezovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf00bd6-2b34-4303-af85-c13d04fbd676/libilorejegukedixuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3acb93a-26bd-4b01-9165-cf5c7aeb1b7d/gurud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3cf89b-415c-43b8-8b30-5a2c9138fb71/99865308373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b240a321-0f3e-4c0f-b23a-7f08cf70d80f/23151935814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f01d781-1e89-43bf-a4e2-dbe8ca0ac6ce/13174063043.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_off000065ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EE 5112 bytes
SHA-256: 46402d9e9fb7326d304e8cdd7091504661408d67e934b5cb48892795b13341d0
font_01_sfnt_off00007758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7758 10192 bytes
SHA-256: 58e5e864a424971cc4ef0e532d4cfee6907c2dbfb9ac9fd380afedb55a276073

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