Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea8b24e0fbfdd9…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 07:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d21e3e5fa1c0b0039c96e6bb7ae29609 SHA-1: 24085806b29ed62e48cefb1f7bcc8b7fc4a1ca20 SHA-256: 99ea8b24e0fbfdd931257745ddd1ab177e562828d26ed27beea96f044b245e74
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, suggests a lure related to educational materials ('Probability worksheet for 7th grade pdf'). The presence of numerous external links, many pointing to Shopify domains, indicates a link farm designed to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=probability+worksheet+for+7th+grade+pdf In PDF document text
    • http://files.btmpostech.com/uploads/1/3/1/4/131410818/tojupujev_wavakevajuriwu_vuwamerodevo_zukapanajonun.pdfIn PDF document text
    • http://ruxewa.tell-consulting.com/uploads/1/3/2/6/132681670/962b2e3.pdfIn PDF document text
    • http://files.meridiancyclingclub.com/uploads/1/3/1/4/131408581/2743413.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/1/0433/0687/7080/files/mojedisubeweful.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/cbse_syllabus_for_class_11_physics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/22604262733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/6202208429.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6728/5404/files/devatiwasajenazenewek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/8783/3762/files/human_anatomy_8th_edition_marieb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/anthony_robbins_books_greek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0113/3731/files/febivigefawibozegawupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/tight_pants_syndrome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/kirefujoxuzuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/72670731109.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_off000064c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C0 5784 bytes
SHA-256: 7c548c2b42f849d0a0ce48a1a900eadd55b3f27524e8a0034a76d84299d6e53b
font_01_sfnt_off0000787e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787E 10540 bytes
SHA-256: 8b55d720e5335afbdf9f7769b5e9453d2e46ab146bafbab2ac6fd43733230523

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