Malicious PDF — malware analysis report

Static analysis result for SHA-256 8866f6c9a551af17…

MALICIOUS

PDF

39.2 KB Created: 2020-08-15 00:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7da81cff1fe796dde4460412fdea4598 SHA-1: 290351e6662cf1bfd62e8afd0f99a9071d6027e5 SHA-256: 8866f6c9a551af170b15897f44891557f032cb9b5e96e9b1d7a7d378eba11f4f
194 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links designed to redirect users to external websites, masquerading as educational content. The primary redirector URL, https://ttraff.ru/wb?keyword=arithmetic%20worksheets%20year%205, is flagged as malicious. The document's structure and embedded links suggest a phishing or scam attempt, likely to distribute further malware or collect user information. No scripts were extracted, but the PDF's nature points to T1566.001 (Spearphishing Attachment) as the likely initial access vector.

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/wb?keyword=arithmetic%20worksheets%20year%205 In PDF document text
    • http://gebofeva.reneparagas.com/uploads/1/3/0/8/130813077/winakow.pdfIn PDF document text
    • http://files.mjohnson7.com/uploads/1/3/0/7/130739060/lerisutelizatetel.pdfIn PDF document text
    • http://kisatoti.normanchildrenchorus.org/uploads/1/3/0/8/130813059/wogixirevali.pdfIn PDF document text
    • http://gamukax.windwardtoeden.com/uploads/1/3/1/3/131383645/9746102.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/1/0435/4693/5451/files/28766624217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3363/9584/files/tosusaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/56098971062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/guzumonek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/gutimepij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/kuwamomojejuxazeduxeru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/povinediwabiwuwakas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6032/0669/files/66997481755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9186/8313/files/rename_multiple_files.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1116/2790/files/12974079290.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_off00005a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A84 5380 bytes
SHA-256: bcfbccc119b2f19381a5baafb29b1214e879350c6e8f294b0cf1c3bc5721d4bb
font_01_sfnt_off00006cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBF 10428 bytes
SHA-256: 9bea041404450db56623036f51cfe26d942e5995faafec9ca5117a0204e4ada6

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