Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf951eccc8dd877…

MALICIOUS

PDF

42.4 KB Created: 2020-10-30 11:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9fb838ec5c1ae90207fe0b4e8e3f0258 SHA-1: e729614483246886856f99dff9bfc7845ca7eae7 SHA-256: bdf951eccc8dd87736e4837bde5652135fe011dbb61e0405c002b6632d08792a
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.club/123?keyword=completing+the+square+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_5f9b9be858169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f8af7b327b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f925f1ab4480.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/1/0492/1868/3046/files/deludo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c26e065-3551-4949-9d0b-6ef4d074a4ff/sofekekamasulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/1737/2565/files/14242257351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344c9d58-eb72-44e7-9ff1-b56181f7d1c9/watipatanukodulijekunesu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4518/9310/files/mupifugudupixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/8089404675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3320/5149/files/21502934779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4833/7059/files/vozazaxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8576/6564/files/dejimep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/rotenejogifebumikona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5277/5604/files/97577899473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8770/3453/files/catalogo_mecanismos_schneider.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/0487/5680/files/reckless_love_chords_key_of_e.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_off000062b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 5644 bytes
SHA-256: f071397c2a39014ea24e662dbfd5dd5def2ad2c3ee92850668aab906bf8abefb
font_01_sfnt_off000075c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C0 11464 bytes
SHA-256: 2e5b64da7fa310d8292a8e3a5174ad72bb028c89af85b1e108cb4c32d8fcdd44

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