Malicious PDF — malware analysis report

Static analysis result for SHA-256 c017628f113eb781…

MALICIOUS

PDF

52.2 KB Created: 2021-06-08 17:36:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 84043b65a3aaf6bf8eb80533deeb15ee SHA-1: b6b04b8c24ae8e929f85805516561eef9bb6e692 SHA-256: c017628f113eb781ddd34247d6a956767df5caf5fe088ff84ecd20cee4b32edf
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including a high-priority lure pointing to a "free generator / game hack" website. The document body, though heavily obfuscated, also contains similar URLs. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://netcdn.tw/app/431946152/free-4now-info-roblox-game-hack PDF link annotation
    • https://reggieslockandkey.com/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-hair-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000538e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x538E 26636 bytes
SHA-256: ca571c328090810b6be57c97c3b1be6b359a169428d7d13690597954f9db7cb2
font_01_sfnt_off00009131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9131 7488 bytes
SHA-256: bf4dba7ee1ab268c128fbc5f1a7bff0989538a2abe961433cb22fe897d93d3d1
font_02_sfnt_off0000a9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E1 18172 bytes
SHA-256: bf5dd94a9c0311711c6d307118d7125ca212be6f41c8fd3bd55fb40db1301bfa

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