Malicious PDF — malware analysis report

Static analysis result for SHA-256 2284cef9c9ff393d…

MALICIOUS

PDF

42.9 KB Created: 2021-05-16 10:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 560166c3aed6aef55b99a4637aeffbfb SHA-1: 6e70c5e9681f6d79be3a10b7c008a8156a31d395 SHA-256: 2284cef9c9ff393ded0c4b2a5421f2f2d4edb5f17a0ab39a52c9a3b39a4bc944
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 0.9971

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/can-i-get-free-robux-game-hack PDF link annotation
    • http://tc-kulmbach.de/images/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-script_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/i-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/master-coins-free_GM406889139.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_003_off0000458d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x458D 27512 bytes
SHA-256: 0ae18a7e5e904b543ea7456f014ec6ad6f84e92c665213c3994e76e919d7e6b5
font_01_sfnt_off00008500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8500 18344 bytes
SHA-256: a3821bea5d8002917ca36036ff520c3c0be187df4be91a81bd8356ddd2b369c9

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