Malicious PDF — malware analysis report

Static analysis result for SHA-256 8921a7725770634a…

MALICIOUS

PDF

45.3 KB Created: 2021-05-17 08:58:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4590a444206247caae5cf1e2fd1b7eec SHA-1: 235ab2ff0a5c0c53a258d1399ad98e8f9af7e27a SHA-256: 8921a7725770634a0e58b653b2b73ebf3277e6f652ef68f50307291e26f1b0ca
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/how-to-get-free-hair-on-roblox-2021-game-hack PDF link annotation
    • http://bibliodetki.ru/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/robux-today_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/roblox-hax_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-robux-without-survey_GM431946152.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
font_00_sfnt_off00004841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4841 24080 bytes
SHA-256: 6322fb7d0cda852dd93e72fadc8b9d38478fc56b53e75b4c2586257b188b9372
font_01_sfnt_off00007f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F93 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00008c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3B 18968 bytes
SHA-256: 455f9f757065c9d134854ae3a28681843daa7c296a8d9a099cd1295f43c3d2ed

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