Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b83bfd63be745d5…

MALICIOUS

PDF

34.5 KB Created: 2020-10-11 02:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6a0344ca1fad9202aed5517e62b24c55 SHA-1: e74ada69be76fc7db9480eee3089b434abd72a08 SHA-256: 4b83bfd63be745d5c73835a1c6c07c4147017090274542fadfe4a04542359fe0
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://ggtraff.ru/strik?keyword=maryland+driver%2527s+handbook In PDF document text
    • http://powiwiter.fruitforests.org/uploads/1/3/2/7/132740990/vikunebo-gegujidojatopi-bafebira.pdfIn PDF document text
    • http://rovabiw.jeffdunntrombone.com/uploads/1/3/1/1/131164439/xewutomaluwozuz.pdfIn PDF document text
    • http://megit.stgeorge-hawthorne.org/uploads/1/3/0/7/130776394/jubokovifenaf_fudovuselalusu_luzubujuf.pdfIn PDF document text
    • http://viseloxes.royaltouchcatering.com/uploads/1/3/0/7/130738914/58d1a6abad12.pdfIn PDF document text
    • http://kusef.alchemistmovement.org/uploads/1/3/2/7/132740900/6ec5bb075d00.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/8cabe6b8-2e17-41a0-8a0e-a8c811ed2b97/zejufumupuzil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840b9987-5b8f-4d9e-9fc0-bd8c0357d39d/26724768158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae7adee-2ed4-466e-b9f9-0f7cac2ae458/julexemapilonusanoxab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1393/7064/files/club_penguin_oasis_igloo_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3895/2610/files/the_outer_worlds_guide_to_mechanical_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3224/7457/files/dafim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3264/8602/files/doreen_virtue_angel_numbers_222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/citizen_blue_angels_watch_battery_replacement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5702/7992/files/ghana_traditional_wedding_clothing.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_off00004951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4951 5316 bytes
SHA-256: 2e6949c1fcf0a6ad00d4046b08b7b6754b491473543758e7c4d395dbc42e1066
font_01_sfnt_off00005b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6E 9984 bytes
SHA-256: 0fc1d3f914a62416eb6ea2b78060fbccbfc7cf9c691a9260bfde812c5f6d3ffe

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