Malicious PDF — malware analysis report

Static analysis result for SHA-256 4538adddee310efc…

MALICIOUS

PDF

58.4 KB Created: 2020-07-28 12:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 12344a32f883ac487631cc3f82c1d2d5 SHA-1: 4110e1716276b25a229db8d7c67c12c3cc862d54 SHA-256: 4538adddee310efc230975a67036bc7407e7074ce0753fb9efa0d71b072e3090
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to academic papers. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing strongly suggests the intent is to redirect the user to malicious content. The ML classifier also flagged this PDF with high confidence.

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=computational+and+algorithmic+thinking+past+papers+pdf In PDF document text
    • http://files.manchestertrees.com/uploads/1/3/1/3/131380107/fazuxelexibabag.pdfIn PDF document text
    • http://files.bluebirdvignettes.com/uploads/1/3/0/8/130874128/e8df45f7cbfd6.pdfIn PDF document text
    • http://files.jessicamaryrobinson.com/uploads/1/3/1/8/131871648/9773068.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/1/0433/9911/9013/files/15777942124.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/ragopasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6236/1245/files/6107648905.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/wajubakegajisorasajupako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/85300940348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4389/5966/files/9737625497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/xojij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5069/5830/files/13154011230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/vufezivasofakavexikivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/bejenolomoxoposovoxafivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/86043957164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/sipakirad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.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 4

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_off00009b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5C 5536 bytes
SHA-256: c403c8b0ae2194b280f09f222ef7de801d834dbb0240bdcb12c84456dd3d27a4
font_01_sfnt_off0000adfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 14872 bytes
SHA-256: e228ee6e1b246f481cb251e67c6536b3bfc674bfd5cecc7c1a5a26ba6a19aa49

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