Malicious PDF — malware analysis report

Static analysis result for SHA-256 7103ddb859dd1854…

MALICIOUS

PDF

48.5 KB Created: 2021-06-11 01:04:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8e83e160ed803054c426381a2bb9b483 SHA-1: 5b4f2322801a66d4cbfc258d738086b7527fe811 SHA-256: 7103ddb859dd18541614b9f74b77fbd79549ddba5e43a3e0ef3611820783b4c3
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 0.9796

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/roblox-game-that-gives-you-free-robux-game-hack PDF link annotation
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-one-death-run-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/rxgate-cf-redeem-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/join-this-roblox-group-for-robux-free-london_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005211.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5211 26528 bytes
SHA-256: 1b8d16cab693354f1b6bcebae4279b1e82916270f1741c488f5cb7a299ee0d66
font_01_sfnt_off00008de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE7 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000097f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F6 19240 bytes
SHA-256: 9249baf8d3e1c061a82e0029f8b3eeef0f1cdabc3465870a573b78fda1898f55

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