Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cfe451debf20a9…

MALICIOUS

PDF

55.4 KB Created: 2020-10-12 15:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 33ad8f1f3a6ee7d0985822644e27abef SHA-1: bff0765bd4bef92d8b47e5beed072ac61a358e3f SHA-256: b3cfe451debf20a92781646fa12a1f700f865fd1e733c4bdc47505c57b960890
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=cuidados+intensivos+neonatales+augusto+sola+pdf In PDF document text
    • http://files.krshairandwaxstudio.com/uploads/1/3/0/7/130775784/simajefebakegu.pdfIn PDF document text
    • http://napas.flyajetsim.com/uploads/1/3/0/9/130969690/sagivi.pdfIn PDF document text
    • http://files.baviaarts.net/uploads/1/3/2/6/132681632/ccd088a0a72cf9.pdfIn PDF document text
    • http://ludoneki.g3digitalmedia.com/uploads/1/3/0/7/130738625/vefesowidezasex.pdfIn PDF document text
    • http://files.lightingshowroommullingar.com/uploads/1/3/0/7/130776046/jasopuwanezisorowa.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/c108bde2-8892-477d-9e22-6ef313a250d5/xixuzodenidiwokiduwak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a36d0cd-af0a-424c-beab-d05f58f2f0ad/wezifezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b11c21-9931-4ed3-ac69-206b12b0b7c5/49524796088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecef7371-3397-4543-92cb-ebb0904bf38b/nopupikawizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bdf0d6-d470-4229-97af-bc2e9dcbb574/35092515721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06be7b72-f36c-4f77-b595-5618f6b808ca/goponivibavifunob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0842/8704/files/dafivudisawoniditus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4544/1695/files/acids_versus_bases_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/etsy_seller_handbook_uk.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_off000093b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B8 5076 bytes
SHA-256: 42257e73eeb49e60c7123ff492d5f445c51356770d4dde143cc7da9e9498aea0
font_01_sfnt_off0000a520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA520 13036 bytes
SHA-256: 8a157752e219ac6a8cdafd9ba4db3d6689cb477609d80842cf4794e5dd229ab0

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