Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e99268120e80dd…

MALICIOUS

PDF

43.7 KB Created: 2021-05-13 15:34:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9efc4f8aaf4f60e0deb638ff907fd1e7 SHA-1: 11bd06ab8b29bb0fe6010d8b11b6afa69024e338 SHA-256: a2e99268120e80dd337d918b809ce313ce4eb71caa2aefbcd77a99ecb2d11b4c
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 0.9969

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/431946152/free-robux-sites-that-work-game-hack PDF link annotation
    • http://knjiznica-oroslavje.hr/files/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/robux-win_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/best-free-minecraft-hacked-client_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_003_off00004947.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4947 26776 bytes
SHA-256: 72966413abeba827f819f427d10b2c29b2bcd56ad8c935222216dabcb6952d32
font_01_sfnt_off00008644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8644 19000 bytes
SHA-256: c0bc6bb0706fab35ff455fc4816471a1ab7f6ae4486f691ef98043b3efa3f18d

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