Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb1f3e5a5f50dd8…

MALICIOUS

PDF

46.2 KB Created: 2020-07-31 11:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 845ba3d058715575e13d3e034fd7ea60 SHA-1: 3a3269554395ccafdbc29e4e67299b8cd01d0a7e SHA-256: 4cb1f3e5a5f50dd89a7dec16ca508aa991fd69bcf9789b6842c7de7be320a496
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains embedded links that point to a redirector service, which is a common technique for distributing malware or phishing content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that the link leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'Antenna theory analysis and design 4th edition solutions pdf', suggesting a lure to trick users into downloading malicious content.

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.com/pify?keyword=antenna+theory+analysis+and+design+4th+edition+solutions+pdf In PDF document text
    • http://files.amboy.net/uploads/1/3/1/3/131380042/a761d0d.pdfIn PDF document text
    • http://files.shaymacmorran.com/uploads/1/3/0/9/130969577/2068485.pdfIn PDF document text
    • http://files.etherealsanctuary.co.uk/uploads/1/3/0/8/130813827/5ad7232.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/1/0430/9575/2864/files/fedomutadole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0047/0438/files/45857861109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/wowuxibilapewa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1983/7345/files/81048827674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/27105555872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/75587976369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/kutujerawonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7120/1699/files/sosipixubuwerebudowowavug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/90063276871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4582/1338/files/33726673175.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40545468116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/fesoluzizidotit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/54370238291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/notumitonemazamom.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 7

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_off000076b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B5 5364 bytes
SHA-256: 2bd43a2dac6a46f7fb6c55cf43008d6bdb8134795dcd1fa7a483b9f149c84c6c
font_01_sfnt_off000088f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F5 9880 bytes
SHA-256: a840f2b0c8d6997b14a52b8b87bd3f8ea4d4dbe5d44173d105230c2707237c96

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