Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc402cf6d9a2f48e…

MALICIOUS

PDF

39.8 KB Created: 2020-08-19 17:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 70a69a1fadf768417cf24bea1a7fe875 SHA-1: c19e21aed091c206603d02cadacbf8daabda0b7a SHA-256: bc402cf6d9a2f48ed60d9134dda5ddb3ca9283840aea35fc3e49a5b8a9f90428
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 of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to 'maths worksheets' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous PDF links also indicates a link farm strategy, likely for SEO poisoning or to distribute malicious content.

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.cc/pify?keyword=maths+worksheets+ks1+year+2 In PDF document text
    • http://files.niassestudios.com/uploads/1/3/0/8/130874318/b919e96e4ba.pdfIn PDF document text
    • http://files.storytellersnz.org/uploads/1/3/2/6/132682929/jibaredadi-jamosojukafo-tupasedigodiw.pdfIn PDF document text
    • http://files.fisherah.com/uploads/1/3/0/9/130969545/5654798.pdfIn PDF document text
    • http://zoxodeme.jeffreytedford.com/uploads/1/3/2/7/132740214/6762ce7afc80b5.pdfIn PDF document text
    • http://files.rhsglobalstudies.com/uploads/1/3/1/4/131437157/pemepabojajezoxu.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/1/0434/1514/2567/files/28465130533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/xomigaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/calling_in_the_reserves_vanilla_wow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2919/8998/files/risk_management_in_software_project_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/93051133703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7209/2315/files/23916267397.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/lagavifelurufirilipitekas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/28869203617.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_off00005e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E74 5188 bytes
SHA-256: d676c0077a84665219bde4041a389a8b7028c150d3d351f58ae29ca4757a5340
font_01_sfnt_off00007038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7038 10088 bytes
SHA-256: a164f08dd4997bf761e1b3a11f52bcb0490c22b5984a8a005288ba8df7e51d70

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