Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66b636b8348bbb2…

MALICIOUS

PDF

41.7 KB Created: 2020-08-07 07:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 13d63ce0fa461554230565f09785a2f6 SHA-1: b9d9691906c8db55ccd68f3abd12bbd82ed19043 SHA-256: c66b636b8348bbb24e28fb806ba216aacd63a80d7da1505711a6cef0887b6846
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of a large link farm, suggesting a tactic to increase search engine visibility for malicious content. The primary malicious URL identified is https://ttraff.cc/pify?keyword=calcium+oxalate+kidney+stones+pdf.

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/pify?keyword=calcium+oxalate+kidney+stones+pdf In PDF document text
    • http://files.mciea.org/uploads/1/3/0/8/130874205/b05df30f92d9.pdfIn PDF document text
    • http://totev.differentshadesofcomedy.com/uploads/1/3/0/7/130775795/1162930.pdfIn PDF document text
    • http://nolupegax.talesfromasketchyartist.com/uploads/1/3/0/8/130814017/wufiso.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/1/0434/4800/8866/files/kesipurugozavejomapapate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/xujuwewudoluwune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/wotlk_jewelcrafting_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/simple_poll_discord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2442/2811/files/webogiwadubodoraju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/73635476504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8634/8450/files/kunabegabadevofakakazov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/663040138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9624/3364/files/ky_driver_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1077/6484/files/gotowok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/bigej.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_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 5344 bytes
SHA-256: d43603fd5bece9f024c68d87ee6d27e083fd7c646a95cba579ed60eb50b82905
font_01_sfnt_off000077e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E8 10020 bytes
SHA-256: 11b047ecac385faeeefc68a6dc2f1c9c2e171aefc3122e53575b9cdd0c863449

Open this report in the interactive analyzer, or submit your own file for analysis.