Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a377c4d9b5f3b8d…

MALICIOUS

PDF

176.7 KB Created: 2020-09-20 07:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 533ab4afe45b38d2e4b5120ea8f3f4c5 SHA-1: 6546d3669ac8f8336ea3b6771aacfc273a914f2c SHA-256: 6a377c4d9b5f3b8d7ee6a86ad43ca21f4937b6d37969d9384c22afef46bb4b0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a search result. The ML classifier strongly indicates maliciousness, and the malformed stream length suggests an attempt to hide exploit code. While no scripts were directly extracted, the PDF structure and the presence of a malicious URL point towards a phishing or malware delivery attempt.

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.
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/wb?keyword=persona%203%20kenji%20location In 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/1/0437/1261/0457/files/64083342160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6652/3809/files/hotel_california_tabs_capo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/guidelines_for_developmental_coordination_disorder_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/xutobobepoxuzubane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/74383505401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/wurijirawumerezuviduno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/kemutitesexediw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/walmart_apply_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5424/1694/files/luwuwate.pdfIn PDF document text
    • https://6e9d004e-55df-445b-af38-5c47361f8be2.filesusr.com/ugd/405339_8fef814695294250b054b0db4a939fff.pdf?index=trueIn PDF document text
    • https://0499d8e5-c318-47df-bfba-f74fa942e351.filesusr.com/ugd/405339_01739cffbe774638a8fc726505293fd9.pdf?index=trueIn PDF document text
    • https://b92b530a-636d-4446-8d65-a4f198162a65.filesusr.com/ugd/1be480_1f7d3a4897af4789a80692c3cb9b7fce.pdf?index=trueIn PDF document text
    • https://f3072a6b-57d1-45c7-a70d-2b3c80c09bb9.filesusr.com/ugd/21e9e0_d50d7ceb83f44c71a66e07cba2b2bc62.pdf?index=trueIn PDF document text
    • https://08445d65-a651-4d2a-8159-2a5b94d5c809.filesusr.com/ugd/c12414_d761858be0d042f68784e237a8b62720.pdf?index=trueIn PDF document text
    • https://436bdcda-0055-4bb9-a307-1496f642203a.filesusr.com/ugd/c6ac46_f6966408ea4d4e5a9aa06d87ca4fc58e.pdf?index=trueIn PDF document text
    • https://801964ee-9b7c-4837-b1bf-607a50424e47.filesusr.com/ugd/ceb2e8_3b270aa4e6494b17af829ad3df584b55.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ad21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD21 69960 bytes
SHA-256: 446ec8f695c8761b23553e51602c89f72570a09e7a1f856ad28c503f04cbd89b
font_01_sfnt_off00027ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27EC4 5100 bytes
SHA-256: b73aa8088b8c6de7dc7377fdc8e0f476705dee0d2e7523b4bf2c88bc89dbb9a4
font_02_sfnt_off0002902d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2902D 10744 bytes
SHA-256: 4e2dbf54f86a2a25715ba2fb81c526881c46e55f0cd6c19139829b1010f96a79