Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9159db3c6696dc2…

MALICIOUS

PDF

39.9 KB Created: 2020-08-12 07:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 071614684193391b17ba87eef054b819 SHA-1: ff705b53ebccfe4d66cb3ed75f349fafb1378931 SHA-256: b9159db3c6696dc2a2242056cc6d7ed54bba0e9d0dc335d1ee2afa3b17bb8b12
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector at ttraff.ru. This indicates a link farm or redirection strategy to obscure the final malicious destination. The document body, though corrupted, suggests a lure related to 'rational numbers worksheet grade 6 pdf'. The ML classifier 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=rational+numbers+worksheet+grade+6+pdf In PDF document text
    • http://files.cpprocketry.net/uploads/1/3/1/4/131453574/3286691.pdfIn PDF document text
    • http://files.teamemfield.com/uploads/1/3/1/3/131379792/61233.pdfIn PDF document text
    • http://files.nphsjrwolfpack.com/uploads/1/3/1/4/131483253/pageponiputi_gosalobire_vopepas_fatibo.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/1/0432/3062/5947/files/dabitabavakisorovigeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8201/5135/files/31986620359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/nuxuzuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/zijimof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/rizikizolobizotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/revelation_road_the_beginning_of_the_end.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7510/7992/files/judokanen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9054/1728/files/alice_adventures_in_wonderland_lewis_carroll_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/87375734235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/1545/8215/files/boats_and_streams_for_bank_exams.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 8

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_off00005c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C36 5912 bytes
SHA-256: 4ad4b78ba94fc1a283b6ee85f679ad6bb0e9ba9250a370c415ad92b3241d6b35
font_01_sfnt_off0000703e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703E 10192 bytes
SHA-256: c89636634b23fce2eb868125a5a51349f08209aa1dd0fa340165b6e075cf5b22

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