Malicious PDF — malware analysis report

Static analysis result for SHA-256 794b8731ebd2fe77…

MALICIOUS

PDF

40.5 KB Created: 2021-05-19 03:25:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f9965ffe0baff74738ab621385b9e569 SHA-1: 5974612e5c87b79e41765eb8ce2c77b5ef5e10f0 SHA-256: 794b8731ebd2fe77226ba4a5df8feb3b9697bcce718fd68ea5db7bb7aee679a0
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 0.9971

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/835599320/tiktok-free-blue-tick-game-hack PDF link annotation
    • http://immo360grad.com/images/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://immo360grad.com/images/pubg-2021-uc_GM1330123889.pdfIn PDF document text
    • http://immo360grad.com/images/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/pokemon-go-free-98_GM1094591345.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_off0000458f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x458F 24160 bytes
SHA-256: 272ee23acd12a8e7e00a00f2ca7daefcbdad81dbfa0f8f5ae0f45816b0497f5b
font_01_sfnt_off00007cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF2 17888 bytes
SHA-256: 571b60ed8adbf01fc113f9fac693a748634f7e5811530a03c8c8bb0ceeef27a5

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