Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b1b575acc74401…

MALICIOUS

PDF

37.5 KB Created: 2020-07-28 00:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 64a369bb38394ff39cf4b417980499af SHA-1: 82528da952957a95dd8353423c22d5359e1b49e3 SHA-256: 76b1b575acc744012270a15986c39c5a2a74e3013f97fafcbaa4503462253a5e
194 Risk Score

Malware Insights

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

This PDF file contains multiple heuristics indicating malicious redirection and link farming. It presents a lure related to 'lecture notes' and embeds a URL that redirects to a known malicious infrastructure. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.ru/pify?keyword=second+law+of+thermodynamics+lecture+notes+pdf In PDF document text
    • http://files.dudleysafes.com/uploads/1/3/1/3/131398419/025eea.pdfIn PDF document text
    • http://files.whistlepigsaloon.com/uploads/1/3/0/8/130874102/kodaru.pdfIn PDF document text
    • http://files.clinicalalliancenetwork.com/uploads/1/3/1/4/131437822/xapodesapeboru.pdfIn PDF document text
    • http://files.nicktroehler.com/uploads/1/3/0/7/130738823/nideto_merubo_busabujatupun_firerewevu.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/1/0428/9835/8432/files/75130531250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0343/6446/files/81345746347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41732402988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/funuvotebez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/waxesazuvijakilodoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5724/9430/files/fupixixipidojituli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/guxakuluvetubijebujobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/kigofunosaxiribil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/19221787332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8700/2790/files/14142281848.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/faduzomaxufe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/25597853120.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 5

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_off00005418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5418 5572 bytes
SHA-256: 9aed70ea905c38bf3f2bfdae14cec0a0290d98f61fb90c333dc96dca1093a706
font_01_sfnt_off000066e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E7 9824 bytes
SHA-256: d5004684873495e3c0e069530f68f5071cefd5b736fa399cfd89126696cb6ec6

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