Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b71ee359186723…

MALICIOUS

PDF

52.5 KB Created: 2020-08-09 21:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c335b99c7ff288bcd4ef594c4aa871b8 SHA-1: 7ec6199d6e82709cf5b638d6a64dc7c4b79e37d8 SHA-256: b3b71ee3591867238abd766a9cc261f4e656c6468b26c4839778171b150417e1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and a URL that suggest a lure related to medical information. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=anticonvulsivantes+en+pediatria+pdf In PDF document text
    • http://files.whatcompjc.org/uploads/1/3/2/6/132681725/802425a3b44.pdfIn PDF document text
    • http://files.nansasmusic.com/uploads/1/3/2/8/132814980/777454bb2.pdfIn PDF document text
    • http://wizasenog.greenlightyourpassionproject.com/uploads/1/3/2/3/132303382/zexanabodolojos.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1/0434/3585/1928/files/99048374695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/xonunozafepadowamad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesulemenakasisot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/7443843439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/vimebuneroxovuwegiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0491/7917/files/cumulative_probability_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/sojemifowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7693/5068/files/100_aviones_de_papel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/2649569115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6983/2354/files/orquideas_de_costa_rica.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEA 1696 bytes
SHA-256: 9a98723dae936e7c7c8d502cfbcf27bf9f93cff28ba6a06675a6a95244fbc4de
font_01_sfnt_off00008314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8314 5196 bytes
SHA-256: 4170f59bd714c82e9d2fc5d9984da07a08f2b78ebaa56f27839998ad8f4e878e
font_02_sfnt_off000094de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94DE 15316 bytes
SHA-256: e8f51a41c5a947db0e2a028fb388c45845e651917bfa96efb0948d4dee7c932e

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