Malicious PDF — malware analysis report

Static analysis result for SHA-256 577266d2da4763fd…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 02:31:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: daaf3b1cf280cf2561d73a81f0188c2a SHA-1: 389ca222f5edbbede5a3f9f814704be75cc3766e SHA-256: 577266d2da4763fdea7d17f807a988cd64b3b5bac8de4c2978468d577505f344
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/431946152/how-to-buy-robux-for-free-game-hack PDF link annotation
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/mcpe-client_GM479516143.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-official-website_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/www-robux-redeem_GM431946152.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • https://elearning.man1-kotagorontalo.sch.id/__statics/gudangsoal/files/rbx-earn_GM431946152.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_off00004a5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A5C 25764 bytes
SHA-256: f22ef463f8b3d147a7bb9efe4b1e5863d1853c916260418a4f4aa6f241f050ce
font_01_sfnt_off000084d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84D6 18356 bytes
SHA-256: 42cf6025b0828d48dcef6abba26d08473f6f67d2383591dd07323470bab2f866

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