Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8cf7192764f8b0…

MALICIOUS

PDF

38.6 KB Created: 2020-08-21 21:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3dc0b950749e443dbee3e708aa1b1cec SHA-1: c84a2e953fc33fca2ec5bcd4907ba6ae94a807c1 SHA-256: 4e8cf7192764f8b0b6822a3d734dec9df984f72c0316db9e2d481c8ce765d3c0
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, masquerading as educational content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL is part of a known malicious redirector chain. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger scheme to generate traffic through numerous external links, many hosted on Shopify. The document body contains the lure text "Dr frost maths answers" and the URL https://ttraff.com/pify?keyword=dr+frost+maths+answers, which is the initial redirector.

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=dr+frost+maths+answers In PDF document text
    • http://files.thislittlepetshop.com/uploads/1/3/1/3/131383760/misekawode-fapeja-rixubemupomi.pdfIn PDF document text
    • http://nofaruru.alphaeta-ucsf.org/uploads/1/3/2/3/132302780/5066951.pdfIn PDF document text
    • http://files.hawkinsfarmmarket.com/uploads/1/3/0/7/130739443/1242848.pdfIn PDF document text
    • http://files.mrsudbury.com/uploads/1/3/0/7/130775712/luzebupusumaniz.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/1/0428/2767/7852/files/71846411177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9914/3838/files/toxevefapuvuropodilurosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/8841675076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/8103/4917/files/origami_bat_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/71521867687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/radiestesia_cabalistica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/guzujapalatepepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/pudin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/pokibuzosojepix.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_off00004c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C77 4808 bytes
SHA-256: 1f6c1151e50a53d2d750bfc671dc0aa5e34f91e2302f464ef3aa77dcf11e8d56
font_01_sfnt_off00005ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 10208 bytes
SHA-256: 62f3cfe1ee62b6262dcba6ebd843ba138dde6d19efe336ef2e10e2e77f1ed8b9
font_02_sfnt_off00007f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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