Malicious PDF — malware analysis report

Static analysis result for SHA-256 457471afdb5ee9d0…

MALICIOUS

PDF

45.6 KB Created: 2021-05-16 22:05:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f3e860eadc918a1586d3a6ad674bbf00 SHA-1: 08a9175363b45b4bcbd0bf97cf508e08f3de5e3a SHA-256: 457471afdb5ee9d006aa0f96076cb979cb8f01efc057513a3bb17c1e2cbd092a
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 0.9507

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/free-robux-real-2021-game-hack PDF link annotation
    • http://kcr-rochlitz.de/images/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/roblox-but_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://kcr-rochlitz.de/images/roblox-free-followers_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
stream_003_off0000496d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x496D 25296 bytes
SHA-256: d5097d16e07e86650a1e9530701edd2caec345631a08b0bd560e423c1da37c94
font_01_sfnt_off000083e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E9 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00008e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E15 18720 bytes
SHA-256: a03d25a6fa0cc118f86b8100faabbd8a2e80035a992cccb98ee09d3278d79c98

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