Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d71828f087f8ea9…

MALICIOUS

PDF

45.1 KB Created: 2020-08-03 12:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4b3c6cd4a3c81c3fcacfad302bda42aa SHA-1: 14ffe8eccb84c740528902652585d6fb408be3a8 SHA-256: 5d71828f087f8ea903211b44db755c90a066c60a44a8ea23ceb635e9935aa37e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to an SEO redirector, which is a common tactic for distributing malware or conducting phishing. The ML classifier strongly indicated maliciousness. The document body and embedded links suggest a lure related to academic or technical content to entice clicks.

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=ontology+learning+and+population+from+text+pdf In PDF document text
    • http://files.dhsupwardbound.com/uploads/1/3/1/4/131438784/34234af2.pdfIn PDF document text
    • http://files.quinkydinkdonuts.com/uploads/1/3/0/9/130969194/jozop.pdfIn PDF document text
    • http://files.hchskewaneeshelter.org/uploads/1/3/1/0/131071258/sanijikakuku_sifub.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/1/0430/7818/9205/files/taxegefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7701/6483/files/regarubasujapof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6535/1071/files/95866001011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/55217510816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6582/7747/files/kha_zix_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/79230640610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/23102169451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xazome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/muredavopelime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3208/3612/files/brew_install_qt4.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_off00007221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7221 5380 bytes
SHA-256: b7d0bc4ed862cc3e719cd848ce1a1fb927646ba89b2435f8acb863ee864a3e1a
font_01_sfnt_off00008469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8469 10252 bytes
SHA-256: 972033325aa693ab812f56a0184393825d6a1319d7673ca0db9219c1cc13a850

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