Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6ace7091f84098…

MALICIOUS

PDF

40.2 KB Created: 2021-05-10 11:41:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5122e55b820a2a240ee45e97a0a32fc8 SHA-1: dfc1f92f84c4cf6a0e32fe45d6c2ad79692396d5 SHA-256: ef6ace7091f84098f7d258cf5b43d7d786ed9fb27088ce3fafbd64f51d519dcf
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 0.9941

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.xyz/app/406889139/free-spins-coin-master-apple-game-hack PDF link annotation
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://pustaka.stikeselisabethmedan.ac.id:84/repository/coin-master-free-spins-link-31-march-2021_GM406889139.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_003_off00004092.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4092 26180 bytes
SHA-256: 26095f6ced1270fff8968cf32e79d931b785689c40d64986774f98742d756f1f
font_01_sfnt_off00007c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C88 17960 bytes
SHA-256: 436eaa300ecb98e79430677b69defb92df5311e4df3c2f37f833906bb9b7ba97

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