Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5862389359a2026…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 21:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 370c3ff4b3d5a6f968fe5c1218497eb9 SHA-1: 08a4d26376ee55e1f0518b071e6576e93000bac1 SHA-256: c5862389359a2026b05368661b5c34211ef85dff3d54abfb0ff8e699cf27c12f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/wb?keyword=kindergarten%20lesson%20plan%20format%20pdf'. The document body also contains this URL, suggesting a lure to trick users into clicking malicious links under the guise of a lesson plan. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=kindergarten%20lesson%20plan%20format%20pdf In PDF document text
    • http://files.awakendancetheater.com/uploads/1/3/2/7/132740488/c8b5436a64cf.pdfIn PDF document text
    • http://files.dursochiropractic.com/uploads/1/3/1/3/131383284/2582778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/58075385070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8236/6624/files/26796026846.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2131/1910/files/mongodb_update_document.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1401/1555/files/xaxej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6388/6495/files/77375615413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/kopinivikixegoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1907/4716/files/desk_calendar_2019_template_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/potufofefe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45E1 5116 bytes
SHA-256: e0a799ecbc0a769bded9fc7e96b4c629c46918425ea4c78f86d8ca75e36b793f
font_01_sfnt_off0000572c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x572C 13472 bytes
SHA-256: 53092c4245484f97e6fdfa7732a9b5c507050d190848b6c5b0495dc4e9ede850
font_02_sfnt_off00008141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8141 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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