Malicious PDF — malware analysis report

Static analysis result for SHA-256 634f3777e3dc3f97…

MALICIOUS

PDF

45.8 KB Created: 2021-05-14 05:34:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4b32f41ccaf2104fe1f447db17845172 SHA-1: 977cf9f9bfa1f80db9e17389d74f41d5eec3b8b6 SHA-256: 634f3777e3dc3f9712cbd80d5411d4a6df82581b2da558fc88c5e81675314540
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 0.9432

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/cm-free-spins-game-hack PDF link annotation
    • http://www.europeancamerata.com/userfiles/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/rbx-free_GM431946152.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://www.europeancamerata.com/userfiles/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC5 26380 bytes
SHA-256: a0029892dfb3f6e4bf8c604a83ad2d1738b93ebb60afec65344de7b4c686f8d7
font_01_sfnt_off00008759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8759 3264 bytes
SHA-256: d66c4080ae284a9b4c30992c5983191aaa0a3e32d3a7f70f5d4649bf393320ef
font_02_sfnt_off000092a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92A5 17672 bytes
SHA-256: c7edaacf3d8891068ee17a427980e4b8712b9880538c2e482dce739b11255869

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