Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef190f8685723bb…

MALICIOUS

PDF

42.5 KB Created: 2020-07-23 23:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4a45de07c3ec29feebf6b470dd01d666 SHA-1: a0e84616e74daeb6cc741f660af793b6bd4b3e63 SHA-256: 3ef190f8685723bb3043cd0da180b7c4306c9f37928065ee80aa95559d5ebeba
194 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to academic content ('mit gilbert strang linear algebra pdf'). The presence of a malicious redirector suggests an attempt to lead the user to a compromised or malicious site, likely for phishing or malware distribution.

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/wb?keyword=mit%20gilbert%20strang%20linear%20algebra%20pdf In PDF document text
    • http://files.redtrustbushey.org/uploads/1/3/1/6/131637307/zosakojofutom-gozobosukowemi-joruparod.pdfIn PDF document text
    • http://files.richmondyachtclub.ca/uploads/1/3/1/4/131452778/2336249.pdfIn PDF document text
    • http://files.myclassicmercedes.com/uploads/1/3/0/7/130775151/mugixeturudo.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/1/0433/1454/4808/files/93884158452.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9167/3763/files/43128703733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/gokuzujanotufimabivageno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3727/6825/files/5797156726.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/46037063262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/tokaguvabamerazutuwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/82230470531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/mipotinuweletori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/witatobibob.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_off000067f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F6 5032 bytes
SHA-256: 40d956205379676aa8ef2f324ee80265638efb6f83fa877c80badfa17260dbef
font_01_sfnt_off00007918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7918 10492 bytes
SHA-256: 2fb29eb50ec0de1ce911443f3cd06bb032e86554690dacd1f149efe3614784f4

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