Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4c664066574147…

MALICIOUS

PDF

37.4 KB Created: 2020-09-26 12:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c446abc0f1c0c95c33029221a91faf81 SHA-1: 2a5833d626209348eb01282e0193cfa02cdd7e1c SHA-256: 9e4c664066574147a5e2a07391c96ddb5c6c4430205f0f1f541c5c8fa20b7605
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://ttraff.link/pify?keyword=9th+grade+biology+study+guide In PDF document text
    • http://subam.elizabethstaiger.com/uploads/1/3/1/4/131453526/bbb4700b3.pdfIn PDF document text
    • http://files.cascadesilver.com/uploads/1/3/1/4/131483383/zutesif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5783/1326/files/10926396332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/takeuchi_tb016_workshop_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/54845392374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/subigiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/94435860398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/merepizegopud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/patexiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1389/6352/files/mifojolokanimetotafiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8144/1181/files/kujafewifabilug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3491/0618/files/ropuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/plataforma_sirena_areandina.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_off00004f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F74 5388 bytes
SHA-256: 82029afb4201ed925f311c22f8ab53a2e702ac9ec65e5df011b3c1f7639e2636
font_01_sfnt_off000061c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 12232 bytes
SHA-256: acdb01044800a7bef583bf8e3474c260f4b44581747cf1da316258cae9634956

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