Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fb5da473723d03…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 16:57:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 933846e2e06f28c26675cc51740c783c SHA-1: 592b3f8bcf8c43ef6761a66ba6204f0fabb139e7 SHA-256: 85fb5da473723d03b5eab0ac8ccd88a53cdc295ed7a51338837d5a155bb18cca
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence heuristic indicating it links to a game hack lure, specifically targeting users seeking 'free followers' or 'game hacks'. The primary URL, https://netcdn.tw/app/431946152/free-roblox-followers-no-survey-game-hack, is directly associated with this lure. While no scripts were explicitly extracted, the nature of the lure suggests it is intended to redirect users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-roblox-followers-no-survey-game-hack PDF link annotation
    • https://reggieslockandkey.com/images/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-generator-that-works_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-apk-hack-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-speed-click-hack_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-roblox-game-card-codes_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/what-tiktok-free-robux_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-card-codes_GM431946152.pdfIn 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_004_off000051db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DB 25388 bytes
SHA-256: 797a6f61d95ffba9da2b0ae390761ac6a006f05d2bff6aeb67076dea8f484370
font_01_sfnt_off00008beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEB 18544 bytes
SHA-256: 198bb1e689314f732dd5cb89156b0b077993f774ec41ec561d272b1266a5183d

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