Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ff4e9662c02ccf…

MALICIOUS

PDF

44.6 KB Created: 2020-08-15 00:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 02607137c70f9488fb0f4bc685e1435a SHA-1: 8ba2300232b5263f0b7547f5d5654ef396688c80 SHA-256: 66ff4e9662c02ccff5a1aba90192d261382492cc12de64261c1b0a0bd4b56e6a
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector service at 'ttraff.ru'. This service is flagged as malicious and is likely used to funnel victims to phishing sites or malware downloads. The document body, though heavily obfuscated, contains the same redirector URL, indicating a deliberate attempt to direct users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=pronoms%20personnels%20anglais%20pdf In PDF document text
    • http://files.amredco.com/uploads/1/3/0/8/130874612/4908829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5925/6232/files/19547292604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/philosophy_of_the_arts_an_introduction_to_aesthetics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/federal_financial_aid_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/53498092764.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/best_vedic_astrology_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/kokixogutimijovikuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/handout_biologi_sma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/candle_in_the_wind_piano_solo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9599/7096/files/schuco_curtain_wall_details.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/modele_attestation_de_travail_maroc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/99083489471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/seismic_design_manual_2nd_edition_free_download.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 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E19 5072 bytes
SHA-256: 6bcbc515b5ebe85f2cdb1947a5d81f95e677aa58010eaf3d3cbc2ac3d0e5fb7d
font_01_sfnt_off00006f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 12372 bytes
SHA-256: 885597e009769f316f9f1a52a088f0f30347988b971b0a64b965105ec4b9a509
font_02_sfnt_off0000963a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x963A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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