Malicious PDF — malware analysis report

Static analysis result for SHA-256 21231a179e0f6625…

MALICIOUS

PDF

118.3 KB Created: 2020-09-17 12:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 21e46dfbc2cdd8cd657e0b5c60d8e5d4 SHA-1: 4fc4d8d2c5950fac0c561b67b65005ae0c0373ea SHA-256: 21231a179e0f6625b108ec544ea96e3059b92f0e428f4cfea6b40f00d11a2d26
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the text 'Gmat guide 2019 pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, typical of SEO poisoning or link farm abuse to drive traffic to malicious sites.

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.club/wix?keyword=gmat+guide+2019+pdf In PDF document text
    • http://kuvawolim.mainecsta.org/uploads/1/3/1/4/131437689/6040667.pdfIn PDF document text
    • http://files.lifeofgraydon.com/uploads/1/3/0/8/130874067/9281528.pdfIn PDF document text
    • http://deragemiv.eatsquare.co.uk/uploads/1/3/2/6/132680981/wapavexulofe.pdfIn PDF document text
    • http://files.thetadprinciple.com/uploads/1/3/2/8/132814977/fuputulizu.pdfIn PDF document text
    • http://fedolejo.iananthonycoleman.com/uploads/1/3/1/0/131070318/39027865.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/1/0431/7731/2411/files/imf_latest_report_on_liberia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/zelizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3974/2369/files/wuvira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2176/9627/files/usps_forms_3533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5604/5981/files/libro_antroposofia.pdfIn PDF document text
    • https://eaee6b7d-e665-4688-9a7b-af6a3de5b2a8.filesusr.com/ugd/b48b60_0090a2314e5c44f4922cf3e36e94dd03.pdf?index=trueIn PDF document text
    • https://eb5cf5bb-e83e-4d8b-849e-85c8b9a1c7e9.filesusr.com/ugd/3b47cb_f05c1493f3a244b0b9c5284ed909fa2a.pdf?index=trueIn PDF document text
    • https://f609f129-1f39-44ab-a7f2-7772707c1bf3.filesusr.com/ugd/cb2bed_838867670a13435bbdb205cafcc3a4a9.pdf?index=trueIn PDF document text
    • https://981fa4d0-001c-4939-af78-fe3a0f0e38ce.filesusr.com/ugd/bc4951_ce712b60cb9a4edc85e947e0d6e146e3.pdf?index=trueIn 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_off000185ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185CA 5568 bytes
SHA-256: 282e129d09f88145df61f4f00870f315a9682825ae0a38ad306a86db00ff6c21
font_01_sfnt_off000198b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198B6 16572 bytes
SHA-256: 2a6344e9617f4b36d57f9896c351aafc507fa62224151808d067aa3c6b87fe6a

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