Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cbbaca74f11c93…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 23:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 935b370c4ec72b4d42bd42b7457e86dc SHA-1: a2031537d8f77fbbf24c4e0f00dab7bf52217319 SHA-256: 12cbbaca74f11c93e40a50d179f2ae1c15c0a957ef6166a010727f908ed9de6e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.com) that is flagged as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure for a clinical case study, combined with a URL that leads to this malicious redirector. This suggests an attempt to trick users into visiting a 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.com/pify?keyword=caso+clinico+de+balantidium+coli+pdf In PDF document text
    • http://files.fittedkitchencentre.co.uk/uploads/1/3/2/6/132696351/zisoxabes.pdfIn PDF document text
    • http://files.norwoodorchestra.com/uploads/1/3/0/8/130874554/6630538.pdfIn PDF document text
    • http://towoziz.lousavage.com/uploads/1/3/1/6/131637814/6732979.pdfIn PDF document text
    • http://files.vegasvalleycpr.com/uploads/1/3/0/7/130776276/03249808.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/1/0427/4028/5607/files/faradelirufodeladasovop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/zudokotasupade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/banunodivenemiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/fowiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1931/3062/files/arithmetic_and_reasoning_shortcuts_in_telugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/vadepezuti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/donubugineropizorulumogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2994/6787/files/nejiwulamikoduromeze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/ruruza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/attachment_theory_styles.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 3

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_off00006af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF9 5252 bytes
SHA-256: 4380936cb46569184eae7a111d6779aa20680dea587d09dab35843e7076894bd
font_01_sfnt_off00007cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB9 10208 bytes
SHA-256: 07d11acc28c616e436b9cb700e4505bf6faa85afdda178c2497b00b7e0f1333c

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