Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fcc137939eb145…

MALICIOUS

PDF

46.3 KB Created: 2021-06-07 03:37:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ae7692096caaa228879afeafeb38405a SHA-1: 967beb6e751da7b71938d4a411687dd448887f3a SHA-256: 76fcc137939eb145f0b41d1a3264f5a705cea6643bf18fdee39198b756db8f1e
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 0.9832

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.tw/app/431946152/cheats-in-vehicle-simulator-roblox-game-hack PDF link annotation
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/pokemon-go-free-pokeballs-no-human-verification_GM1094591345.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/create-minecraft-server-free_GM479516143.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_off0000520f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520F 26820 bytes
SHA-256: 2576411268ddf0225e6181a1d6db264bae098aeda1c562f5ee7f61c8016b9ecd
font_01_sfnt_off00009085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9085 18936 bytes
SHA-256: 3d6952a1dba1ae3a222b954069bb35a01f30f7aeed06219adfc1af2a7a684d33

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