Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da1079b283bd895…

MALICIOUS

PDF

40.5 KB Created: 2020-08-04 23:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2ed62b5f10db30eb9f0e5989bdf141f5 SHA-1: 83b19af91b7286de06356c31aa1d0102958d75a6 SHA-256: 7da1079b283bd8952047c7ca414fb769d75abca78277a4eb3dc847f5a95a8672
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a lure for downloading 'A level biology notes' which redirects to a malicious URL, likely to trick users into installing malware disguised as a browser update or extension. The ML classifier strongly indicated maliciousness, and the document body text, while garbled, contains the lure text and the malicious redirector URL. The presence of numerous external PDF links further supports a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=a+level+biology+notes+pdf+download In PDF document text
    • http://files.myslotweb.com/uploads/1/3/1/3/131398498/xupag-roduwogazesila-sepopi-fosarovutuvixi.pdfIn PDF document text
    • http://files.usucbs.com/uploads/1/3/0/8/130873975/nifuzu.pdfIn PDF document text
    • http://files.wastatefed.com/uploads/1/3/0/9/130968961/vojopa.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/1/0432/6942/3269/files/16706746565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/10354743884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9631/7845/files/23800479268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7069/3282/files/guzub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/83534417067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6055/1062/files/wujuvo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/42751842497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/just_play_bridge_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/4124239353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/ppap_manual.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_off00005384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5384 5284 bytes
SHA-256: 863963331bd505a24890f75860578139f81767d842153bb900d41c70fb20f20c
font_01_sfnt_off000065a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A8 9748 bytes
SHA-256: 2e1f53cfc29fa60281dc9c50622813613dd2c0b98581875e2c7a35a8bc8c567b
font_02_sfnt_off00008715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8715 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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