Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b3b248ba05672e…

MALICIOUS

PDF

53.0 KB Created: 2020-08-14 12:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 234bac82ecaef1fd6966f3e67b94775d SHA-1: bc7bcb543217518852e094f6746ea5d418ecab9d SHA-256: a9b3b248ba05672e3901922e89c813253f449c86f57a626e9eaa2d9c6acabe73
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Ielts speaking band score pdf' and the URL itself, indicating a lure to a malicious site. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file.

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/wb?keyword=ielts%20speaking%20band%20score%20pdf In PDF document text
    • http://files.wicknscents.com/uploads/1/3/1/1/131163669/3080971.pdfIn PDF document text
    • http://wufepa.lsccmn.org/uploads/1/3/2/7/132712207/8215093.pdfIn PDF document text
    • http://files.mckeague.com/uploads/1/3/1/3/131383456/jepajafe-sunopuram-xozebupu.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/1/0433/7316/6757/files/liwibanatajafelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/sopeminivositi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4827/2023/files/zaxiwopadexukikuxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/42050681723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/dagekurix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/beyblade_burst_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/convertir_un_a_word_gratis_en_linea.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/barixekizunoloj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51730359377.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6163/1384/files/binomial_probability_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4248/7972/files/43863631054.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 3

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_off000091df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DF 5464 bytes
SHA-256: 5094c5ac492337e55938a299aa4b838ca61ad57d58167b420b2e48efb7952017
font_01_sfnt_off0000a472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA472 10176 bytes
SHA-256: c6ae8723d22b51a1e61fa5986e1903c593218cc850a712854518d1aad0d47a06

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