Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b69dfe19774c22…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 15:47:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cc5cf36ee11a8c8b1b319db7d400e3dc SHA-1: 260c933375b7719533b03805994c286ba9456fce SHA-256: 77b69dfe19774c22562d224b9258ba18b7fd6219e3437955fa6db19cbe7f5fb8
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 0.9864

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/roblox-hack-no-human-verification-2021-game-hack PDF link annotation
    • http://unilin21.ru/images/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/counter-blox-roblox-offensive-hacks-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-today_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/como-hackear-roblox-2021-en-pc_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/robux-cheat_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/pokemon-go-accounts-free-list-2021_GM1094591345.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000525e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525E 24644 bytes
SHA-256: ced71e04d459eece2d544fb2e828cde48672dbbf6860698a1ff744e0269dc03a
font_01_sfnt_off00008b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B15 19344 bytes
SHA-256: c2719f8b0e707bcf0b2e841db1f94233741b81e437f9602fdec2fdac96e6bf18

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