Malicious PDF — malware analysis report

Static analysis result for SHA-256 3892e63a2384433c…

MALICIOUS

PDF

53.4 KB Created: 2020-08-30 23:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a7af4565612dcb983d9f2599de40857b SHA-1: 573f1378978a7597aac15785d6e666e5c63a2362 SHA-256: 3892e63a2384433cb5884595902b6f2ac1de04b14693713938d0eb0f63c67d43
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=equa%25C3%25A7%25C3%25B5es+literais+exercici'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the lure. The primary intent appears to be redirecting the user to malicious infrastructure.

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/wix?keyword=equa%25C3%25A7%25C3%25B5es+literais+exercici In 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://static.usrfiles.com/ugd/b8c837_3b85c4984ff244058e65dd367f31e851.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ebf6d88b415d42968b2774fa6922d76d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cc10e7_6a863dc2bfc047c9b64d495f31174f14.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f0f215_65921ab551c24b7696d6d98ca6e1dd9c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c207b765a0f34def87e54e84cc07233c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2c250_8b63ef52176c46639c705f8cfce7607a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e4a001_897725adbaf840308ae12a076ae9d5d1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c59dde0f4c0644d98e617d6170bb45ed.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4cc8873b958a4a1c8d8e764c90605f5b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ee4a13_4732229d9fc24f16af955e717565877d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/19ce5d_9313b547fead4467848002cad2d88d8c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0c4177_e16aaa82f42d485ba8759d1f55a01d52.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4493b3712e744fbdae29f68889328556.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_02fdf7ef2b034ecda35f0a51f9c8da88.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4921/2311/files/kisagejewipamebadipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/ripaxujulizolasifito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/sezekamupabepogas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8383/9128/files/76391931667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/5409/1675/files/wizard101_sign_up.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009ade.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9ADE 18448 bytes
SHA-256: 11f352475dca1f40c8aa965bbffe33c097091dd4557b3f101573546459ef8f05
font_00_sfnt_off000062c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 5012 bytes
SHA-256: e1d2a24a3afabc50007194580d4f4a812ae5909d746beff0f324a652b3d4a3b1
font_01_sfnt_off000073a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A3 12840 bytes
SHA-256: 2842b56f0040700c8607e1f5af9fd32cd6cdbd1ffdd31ee2338fce8e51188028
font_03_sfnt_off0000b7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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