Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cd4a20e3ac2eb1…

MALICIOUS

PDF

35.3 KB Created: 2020-08-03 18:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 931a8a8427e11c874c5e3720c1f234fc SHA-1: 4deab866d6cebb1b416936443d394036e2df6893 SHA-256: 72cd4a20e3ac2eb1fb1f65c92869ace30758f25d92750c0d06fab0bcb167eebe
194 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to a redirector infrastructure designed for SEO manipulation and phishing. The document body, though heavily obfuscated, contains text suggesting it is a textbook, likely a lure. The ML classifier and heuristic firings strongly indicate malicious intent, likely to redirect users to a malicious site or download further malware.

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=ways+of+the+world+textbook+pdf+chapter+23 In PDF document text
    • http://files.juliannawells.com/uploads/1/3/1/6/131637881/9550118.pdfIn PDF document text
    • http://vugotikad.seekanddestroy.info/uploads/1/3/0/8/130814058/zujow.pdfIn PDF document text
    • http://files.georgiamartinteachingportfolio.com/uploads/1/3/2/3/132303219/zesujejabeno.pdfIn PDF document text
    • http://files.mdyc.com/uploads/1/3/1/3/131381518/xomajesugatomipadov.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/1/0433/0687/7080/files/38461358607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/52414843217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/30557735100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewobaropelizovijekozuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/83654913578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46287179129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/mulimiwawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/35650174199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3397/7247/files/zasejaguj.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 2

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_off000044e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44E4 6020 bytes
SHA-256: e30a43b06b0b5c0f3c9db887c27eb448b213ccbff36b48f0ba22a132c9183708
font_01_sfnt_off0000597c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x597C 11324 bytes
SHA-256: 4cbfc0a73680349112e7ffba669ca760d4c2567559f89b89600fcbc236c6845e

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