Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4370f560485abe…

MALICIOUS

PDF

42.2 KB Created: 2020-08-25 19:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f331680c21db841c3a3bce66d4fde8c7 SHA-1: 23710ef52c8b78f4f3950f6c9fe1356b5c2e27db SHA-256: ff4370f560485abe0a59075458bbce6683cd580f2d89444df720e76a91f54208
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to an 'English course syllabus for beginner' and a URL that appears to be a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious sites via these links.

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=english+course+syllabus+for+beginner In PDF document text
    • http://files.mariposaband.com/uploads/1/3/2/6/132695525/tojewakop-rulirazuwiw-rurote.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/1/0433/0379/6894/files/35449090430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/xawuxurafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/bikodora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/jubuzuxepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3112/4385/files/jefufunuzideparax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1508/9825/files/applications_of_derivatives_class_12_ncert_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6340/0861/files/information_about_apiculture_centre_and_gather.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2769/2695/files/75653616733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/casio_fx_991_ce_x.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/beseneru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5158/0568/files/3669221383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/normalidad_y_anormalidad_de_la_personalidad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3A 5144 bytes
SHA-256: 290664fe8be4247d1bb299ab9fd38785ddee74479837a7db0ac5841f54014214
font_01_sfnt_off00006bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB3 9936 bytes
SHA-256: 8a588ed42ec6d7c50b060c6aa7a8b56d8ae32e436176b7560f9e1196a1897d8a
font_02_sfnt_off00008da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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