Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a21fb66bd53108b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 05:12:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e0762a2fb4ac5542c3fe87a2ffbd87ab SHA-1: af0a9b15608f1b524b606ebcbad6e454a58e23ec SHA-256: 9a21fb66bd53108b978ddd1a2e4a16b7b2984e9b52a9e4441e4e918dd416ebf2
160 Risk Score

Malware Insights

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

This PDF document employs a lure for game hacks and free generators, directing users to a known malicious redirector. The document body contains numerous links to similar scam-related PDFs hosted on university repositories, suggesting a broad phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious redirection attempt, likely to facilitate further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://netcdn.tw/app/406889139/free-coin-master-spins-without-human-verification-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-cookie-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-glitch-2021-pc_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-hacked-for-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-dll-hacks-for-free-download_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-copypasta_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-old-roblox-account-new-may-2021-ebay_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-old-roblox-account-new_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003226.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3226 22388 bytes
SHA-256: f8023d296e627cd7a1dd8c52cd5950037f997c1ea8a230e93dc8cbf1cc3764ab
font_01_sfnt_off0000640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 19072 bytes
SHA-256: bdaec13618f0e1747add95b1658441227a0f01124ba961934b3940087cc2858c

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