Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d258a52f8113c23…

MALICIOUS

PDF

47.3 KB Created: 2020-08-24 09:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d7577d1c8dd38df4d1c587a68cf03be1 SHA-1: 29e011bc9daf4160dfc9bdd06d0b161237b66b05 SHA-256: 4d258a52f8113c23154fab6bcf53e62b3a287e760e6e51ae9c9c6830c0279edd
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'normal respiratory rate for adults' and includes the malicious URL, likely as a lure.

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.cc/pify?keyword=normal+respiratory+rate+for+adults+nice+guidelines In PDF document text
    • http://files.vetcliniceh.com/uploads/1/3/1/4/131437085/koboraxubuniwa_kajesa_pabunuminori_vovov.pdfIn PDF document text
    • http://fovaz.fhendodontics.com/uploads/1/3/1/6/131636664/1beccdf.pdfIn PDF document text
    • http://files.crosspointkennel.com/uploads/1/3/1/8/131856725/8140822.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/1/0428/5648/0935/files/79221822842.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/zomokufume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/52638700941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/text_over_image_css.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/vutoxipor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/66971558279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1153/8072/files/reniripitim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/trait_complet_de_l_anatomie_de_l_homme.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 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79EE 5544 bytes
SHA-256: 8add6fd884b56bc42cfc614486f875f9418dc596f186c594ebb0bc4283efe1f0
font_01_sfnt_off00008cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBE 10444 bytes
SHA-256: 4bc6486d066440a96c760bf0f8db48f77118ab89dcf618444e5aec41b04e1d3c

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