Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e732c4572e9657…

MALICIOUS

PDF

55.9 KB Created: 2021-06-09 01:36:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 82198d9524cc89e832dad4c7f0be6f07 SHA-1: ab93009a385c8e0bfc4ffbc8d6d38a4a792177e3 SHA-256: f9e732c4572e9657d20441a8aec61afe158f21bf8bcc400101dec57efccf53da
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for game cheats and hacks, presenting a fake CAPTCHA to trick users into clicking a malicious link. The embedded URL leads to a site that likely serves a second-stage payload, potentially exploiting client execution vulnerabilities. No scripts were extracted, but the overall pattern suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9649

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.tw/app/431946152/cheats-for-roblox-unlimited-robux-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-group-botter_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-now_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-acc_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_004_off00005650.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5650 29272 bytes
SHA-256: 2d6103e936a8b8d6566a488f3e497a81fcf524b9f9e32db80d421d1343aff28d
font_01_sfnt_off00009aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA9 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off0000b578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB578 19324 bytes
SHA-256: 5e3a9fffc1fc3020ae557a30456424e7bdbdc72e8eb1a60a216e6c1a000dd166

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