Malicious PDF — malware analysis report

Static analysis result for SHA-256 11649debcd4856ff…

MALICIOUS

PDF

41.6 KB Created: 2021-05-19 01:33:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4b3124b625305bfafa5d9b54815ec860 SHA-1: ea098c7c89c4186452854ed13a9f5682bcde98d4 SHA-256: 11649debcd4856ff591c979a6d104bcbc099e62cd273a0cb52a1c1ee54383ad4
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into clicking malicious links. The embedded URLs, such as 'https://netcdn.xyz/app/406889139/coin-master-free-spins-only-game-hack', are designed to lead users to sites offering game hacks or generators, which often host further malware or phishing content. The ML classifier also strongly indicated maliciousness.

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/406889139/coin-master-free-spins-only-game-hack PDF link annotation
    • https://domc.tw/upload/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://domc.tw/upload/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/oprewards-login_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/robux-download_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/lots-of-robux_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/2021-free-spins-coin-master_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_off000048b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B0 24992 bytes
SHA-256: 785833709594a1c14e61d43df31461bba37bfe100ccf5c0945fc193c1c12adb0
font_01_sfnt_off000080d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D1 18140 bytes
SHA-256: e8323280cfa25f0840c1e0ad6f99419943ef2c7379aa1851e8b4a739432d5c3e

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