Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cd84fa4fdc3d7a…

MALICIOUS

PDF

48.2 KB Created: 2020-08-24 09:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9b5fe2fec2a938cd90eed7a06a2d3d38 SHA-1: bd263d630647a0c2108997c55fa70cbb7f574ba3 SHA-256: 21cd84fa4fdc3d7ac03cec98b10556f04cd7074247c5e9a99c42b2e72db5b1ea
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, forming a link farm. One critical heuristic indicates a malicious redirector link to 'ttraff.com'. The ML classifier also flagged this PDF with high confidence. The document body contains what appears to be obfuscated text and URLs, suggesting an attempt to lure users to 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.com/pify?keyword=student+exploration+calorimetry+lab+answers+activity+a In PDF document text
    • http://files.1stprescorning.org/uploads/1/3/1/4/131483336/1588164.pdfIn PDF document text
    • http://files.fulltiltk9training.org/uploads/1/3/0/9/130968984/duxabeve.pdfIn PDF document text
    • http://files.timelyap.com/uploads/1/3/1/4/131437311/selaridov.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/1/0445/3682/3972/files/zewopurogotadavuzuliwizuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8554/4089/files/vujakotoxufigob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0948/6498/files/20854197740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6576/0151/files/53962027632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0654/7352/files/kopprasch_tuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/firewall_pro_root_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5892/0610/files/nalutazujowipol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/5099/5610/files/abdul_karim_zaidan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8636/2264/files/technical_drawing_text_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/22628839270.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 7

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_off00006f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F27 5668 bytes
SHA-256: cdb5b48ee117df308e5938aa30f7eed1fbe7829d58d23370ad84121289bf9716
font_01_sfnt_off0000825b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x825B 10196 bytes
SHA-256: 8f37b825bfbd880726c0e5be7ede958974839b64aa646719be95c1776674406a
font_02_sfnt_off0000a54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA54D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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