Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad18f4a18b8dc5c1…

MALICIOUS

PDF

37.7 KB Created: 2020-10-13 18:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 73c4d43fbd13158dce6b0d79e2a31f24 SHA-1: 9475acfa36acc4a0a5003908553701bf5cf790dc SHA-256: ad18f4a18b8dc5c120265378e82e4dd475b36952e7cb59db4d92eec2601fdc67
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=subordinating+conjunctions+worksheets+4th+grade In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/c2099e721b.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.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/3d798519-d764-4f4d-8712-a6e61a5dc03a/bamufawufikasizovexaxefev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2342ddf8-7726-4365-b0d2-18b0437e38a7/92065442077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964953c1-6274-4581-a9f2-0e40ce2778a9/83445936699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6af0eb-b449-41b9-bb46-ee1784a37b82/nazugovimosaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0303/9903/files/66140643352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5600/3744/files/fade_to_black_intro_guitar_tab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/what_branch_of_government_can_impose_and_collect_taxes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2224/6042/files/circuit_court_for_baltimore_county_docket.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9423/7593/files/gagusove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00daf61-c324-4412-9e91-7e5e90b20963/7422278268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666478f4-efda-4080-9824-859afd0e5b22/90606118394.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_off00005344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5344 5732 bytes
SHA-256: d40bc53ff758d41cc610bbda4441eeb396b8c9e3179ee500d4225566523a78a6
font_01_sfnt_off000066d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 10364 bytes
SHA-256: 6529ce2a2ff2bd07e69cf6b09a40fa697a6683686fa79650e95a7af8a0b4a03c

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