Malicious PDF — malware analysis report

Static analysis result for SHA-256 0538b996314dbc6f…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 18:40:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a633e7a64660aff3d476be253f1df6d0 SHA-1: 96545e345a72ff1100b72a3fbe7d3ee816170e7d SHA-256: 0538b996314dbc6f3a797d904239dbc7c9689fddfec959054c045d72721b16b3
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.online/app/431946152/how-do-i-get-free-robux-on-roblox-game-hack PDF link annotation
    • http://digilib.stimlog.ac.id/repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-generator-no-human-verification_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_off0000588d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x588D 25920 bytes
SHA-256: 1dcb9f16f70aac0fb34d961e202e1a29fbe7090aaad5e86e25a616b07e2f4d59
font_01_sfnt_off000092cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92CB 18524 bytes
SHA-256: 4ccd670e6a0bad46446eeab730d71d218c542e1f5d690955267ad9a8693a3722

Open this report in the interactive analyzer, or submit your own file for analysis.