Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de88f723803e7d5…

MALICIOUS

PDF

48.0 KB Created: 2020-07-30 13:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9b8b5e0284ca133a4f6286f24796f239 SHA-1: 40136c8425b0f45de9372ba1782e3a4c2128a071 SHA-256: 9de88f723803e7d5c795ce4ba9f6fcea2567d5c0488c31a6009ac5e45afa5973
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 `ttraff.ru`. This URL is part of a link farm designed to trick users into downloading PDFs, as indicated by the `PDF_SEO_LINK_FARM` heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool sometimes used to create malicious documents.

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=applied+cryptography+bruce+schneier+pdf+download In PDF document text
    • http://files.iowaaces360.org/uploads/1/3/2/7/132710497/tovulubumafo_pavirododa_vogutudofebavit.pdfIn PDF document text
    • http://files.stonecutterswsq.com/uploads/1/3/1/4/131437311/vupugukizazal.pdfIn PDF document text
    • http://files.mskhor.com/uploads/1/3/2/6/132682570/fewogedawox-xabuguj-dajelenudunexo.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/1/0431/3631/9639/files/84874126569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/15514292381.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1797/7504/files/27822708073.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2806/1087/files/83448048542.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/7932953739.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0727/0312/files/43703131712.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/43514089156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7764/0093/files/zigegubumebibosatev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/muserubuzowadikoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3455/0177/files/52377351693.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6120/6422/files/49140370149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/sajezomovuguxipululapave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/bupijuguw.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 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_off00007c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4F 5624 bytes
SHA-256: 35ea04421672fa34276f24bec375c5a066dd3159d9f0c270c02247afe4e2fb35
font_01_sfnt_off00008f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6B 10124 bytes
SHA-256: 817d38b5e87b1121275942d0efc5dfad52cdbcf4b6236cc52d5cea8f33de93f2

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