Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc66b2e15ab32be…

MALICIOUS

PDF

42.5 KB Created: 2020-08-20 13:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 75db200f556e8f3122883f841bb7a61f SHA-1: 52f5859f0b61204ea7cc63dc14a4313a04022ea3 SHA-256: 6dc66b2e15ab32beeee4ba199956207663fcb7f492eebec8c1ba799508905ed9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) that is associated with malicious activity. The document body, though heavily obfuscated, contains text and URLs that suggest a lure for downloading a document, likely to facilitate further malicious actions. The ML classifier strongly indicates maliciousness, and the presence of redirector links points to a phishing or scam attempt.

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.ru/pify?keyword=american+thyroid+association+guidelines+hyperthyroidism+pdf In PDF document text
    • http://files.anasofiarodrigues.com/uploads/1/3/1/8/131856987/xezesejijeliv.pdfIn PDF document text
    • http://sanilugo.wassermanlab.com/uploads/1/3/1/8/131871395/5834929.pdfIn PDF document text
    • http://files.sgionet.com/uploads/1/3/0/8/130874413/zujojunejiguwimurob.pdfIn PDF document text
    • http://files.ryderstudios.com/uploads/1/3/0/9/130969238/594601.pdfIn PDF document text
    • http://nirufazib.marktobin.com/uploads/1/3/0/8/130814070/5565218.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/1/0431/6856/3351/files/74415702770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/employee_performance_appraisal_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0032/2458/files/free_first_birthday_chalkboard_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2960/1175/files/sawajen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1306/3335/files/kebule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/musefevasetomi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/numerical_reasoning_ability_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5109/6984/files/2091060545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/marketing_management_kotler_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/54627121354.pdfIn PDF document text
    • https://medlineplus.gov/hyperthyroidism.htmlIn 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 8

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_off00006788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6788 5660 bytes
SHA-256: 637c312ecdb380e89753ef62f6a0888b05473e70323e99639451226e3297b94e
font_01_sfnt_off00007aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA1 10040 bytes
SHA-256: ff2de5451b255a9de1a5103ac0f9a456780577bf120b1eed7f9d6e49cc031e20

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