Malicious PDF — malware analysis report

Static analysis result for SHA-256 89538fa471f1e162…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 21:59:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 83ff44cab15bf73760a2ec2f9aa0d433 SHA-1: 89dbec7a37b6f90117fe0b3c4e478bbf6d93ffad SHA-256: 89538fa471f1e1628aebd584919929f4098f4fced07dd0d8e3986fbdc21f4b7b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. 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 0.9864

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.online/app/406889139/free-spins-coin-master-links-2021-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/generator-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-sign_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/huskybuckscom-free-robux_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_off000050be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BE 29420 bytes
SHA-256: 23a8e6d6b458ce4d37f185f6b522884e8322eb4d8f95f68be15750e03628f831
font_01_sfnt_off00009123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9123 18456 bytes
SHA-256: c809cb62993c96a2792eb05fd7593de41ec7ce02e3f179f2cd9cbcb899f0cf70

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