Malicious PDF — malware analysis report

Static analysis result for SHA-256 431635b0e5717bfa…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 19:42:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8a3316c1a09757c5fb18f9eab12a7640 SHA-1: 0443b949b033be94d05901eac0b351463e83e5a8 SHA-256: 431635b0e5717bfa0546a6c2b7fc5d2c00617c9f08730eabf5d798d22f70d2ac
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a document body explicitly advertising 'free Robux' and game hacks, directly linking to external sites. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' confirms this lure, and the ML classifier strongly indicates maliciousness. The primary URL, http://netcdn.tw/app/431946152/how-to-get-free-robux-no-survey-game-hack, is likely the initial landing page for a scam or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-no-survey-game-hack PDF link annotation
    • http://www.raneenmed.com/uploaded_files/userfiles/files/roblox-robux-legal-free-bekommen_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-robux-codes-livestream_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-gift-card-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/cheat-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/how-to-get-roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/roblox-robux-script-hack_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/cool-robux-hacks-lol_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/how-to-get-free-robux-cards_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://www.raneenmed.com/uploaded_files/userfiles/files/free-robux-redeem-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
font_00_sfnt_off00002f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F76 22280 bytes
SHA-256: 7ea75b77acea6de1b688f64e13a745093d12b7a6c5009d24a4fa15af8e7519cd
font_01_sfnt_off000060be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BE 19280 bytes
SHA-256: 051b1285d740c577603dabb5231f5e4d954de3c0b025fd39f0418c252076454f

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