Malicious PDF — malware analysis report

Static analysis result for SHA-256 99350915404c6ce9…

MALICIOUS

PDF

40.7 KB Created: 2020-08-20 00:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f48edf035a6a737e3335c9ca76bb4ded SHA-1: 1895ee256dd4bd27d86da0ad72d94e64386e51b8 SHA-256: 99350915404c6ce9cd7f31bddfeaddab2c2fb5018de49e21a372a47c020a24f0
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, suggesting a link farm or phishing campaign. The primary redirector URL is `https://ttraff.ru/pify?keyword=polar+animal+worksheets+for+preschoolers`, which is likely used to obscure the final destination. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a link farm heuristic confirms a malicious intent to redirect users to potentially harmful sites.

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=polar+animal+worksheets+for+preschoolers In PDF document text
    • http://files.innovationneighborhoodphl.com/uploads/1/3/1/4/131453022/musokexo_nepugilaguponu.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/1/0432/7515/7670/files/1356799081.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1523/2921/files/pixusofex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/xepokogamorodututoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/rukunupurusariz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6175/4518/files/que_es_el_contexto_escolar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/cristianismo_puro_e_simples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/applied_subsurface_geological_mapping_with_structural_methods_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/zadaxiwivabuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8474/1798/files/tininegefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/fevupudepifoxar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6195/9073/files/65567012513.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/41410808115.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 5

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_off000061af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AF 5412 bytes
SHA-256: 5acaaad5b45ceb968d9719f5ebd13a15061a51616673af8fdf9f3b48a710fe68
font_01_sfnt_off000073fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 9872 bytes
SHA-256: b06daa4076586706d13b0fbdd5f912f5c1f7367464af13f6da69541629550b87

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