Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bb257c6759e242…

MALICIOUS

PDF

41.2 KB Created: 2020-08-22 00:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 36571c7bd729735f1aea3c3aa9e704a2 SHA-1: 67cccd636039f56fbec54dce91c9076094f4309a SHA-256: e1bb257c6759e24295da38f24bcc4eb93877361d5c44cfafdd10f1641ae02bf3
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, characteristic of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for academic notes, combined with a call-to-action phrase. The primary malicious URL is ttraff.ru, which redirects to a Shopify-hosted PDF, suggesting a multi-stage redirection or download process.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ma6453+probability+and+queueing+theory+notes+pdf In PDF document text
    • http://nejodev.shadecreekwatershed.org/uploads/1/3/2/7/132740480/zagumusebawupudake.pdfIn PDF document text
    • http://files.pack131-wrentham.com/uploads/1/3/0/8/130813548/xisavatagesaxotutaxe.pdfIn PDF document text
    • http://files.fretnotes.com/uploads/1/3/1/6/131606262/rutagezigob_sigumolakuxavab_tugararagarika.pdfIn PDF document text
    • http://dopufo.npnewbies.com/uploads/1/3/1/4/131407089/sapisejedidivore.pdfIn PDF document text
    • http://files.kittyangel.org/uploads/1/3/1/6/131607066/pasiv.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/1/0436/7246/9669/files/nivajumeweboteluvuwabed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/guwom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9792/2461/files/algebra_laws.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/14119834606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/titeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/folumoto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/3453363296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1347/8312/files/fogavosamozuro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/1636094472.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3A 6208 bytes
SHA-256: d15273c7d1e95c8c7bfbe30fc59ca46cd1b70b47a5f3524fade2834855ce65bb
font_01_sfnt_off00007240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7240 10524 bytes
SHA-256: 48457c43ea822930e150cc372d63e5e84b997f49cd50e62a2378fdbf8d48eb04

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