Malicious PDF — malware analysis report

Static analysis result for SHA-256 756fb78dffee3528…

MALICIOUS

PDF

44.0 KB Created: 2020-08-03 22:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1f66d0fc67b1a7a0015b61aa2053ccef SHA-1: 2fcc59663d55e368b547a2dfeb792a4fb7327514 SHA-256: 756fb78dffee35289a1f517f398c7e468382515e34825b7bf44d970072ff3bae
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector infrastructure known for hosting malicious content, disguised as free educational books. The ML classifier strongly indicates maliciousness, and the PDF structure itself is flagged for linking to redirectors and hosting a link farm. The embedded URLs suggest a phishing or scam attempt to redirect users to potentially harmful sites.

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=english+learning+books+for+kindergarten+pdf In PDF document text
    • http://files.texasfinesse.com/uploads/1/3/2/8/132815003/b896a412.pdfIn PDF document text
    • http://files.benbloor.com/uploads/1/3/1/6/131606733/devapeguzowosujewum.pdfIn PDF document text
    • http://files.unanapsychologist.com/uploads/1/3/0/7/130775912/0beaa17016caa4f.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/1/0437/2021/2645/files/47831050273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/28490280654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/terukijev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/sifekonige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/38167954996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/she_s_so_unusual_album.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/zizedepavodawowafuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/1336543698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4093/0983/files/83991678876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/zokagewuripil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/xokuvuvenexepevejuwava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/matukatezunufovuvoxixop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6099 5252 bytes
SHA-256: f942201266105c61441b20c88377b6f6edeb74a66cea804d90e85f87a89f4f4b
font_01_sfnt_off0000725b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x725B 10044 bytes
SHA-256: 41d4453c1e503591850343ed61dc710b4dfc3addea9a2283f26ed9a0cf2ec23a
font_02_sfnt_off000094b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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