Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d58c68d3eeb118…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 05:29:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c4f32b4dbe24e9ec2f33ab823c825f12 SHA-1: 80666e7b9068ce41a810503d49b392a76641364a SHA-256: 19d58c68d3eeb118a1ff630cb7758436ab92513b0ee5481871ca5bf1bcbe7807
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks, specifically mentioning 'Roblox Website Robux', and links to a suspicious URL. This suggests an attempt to trick users into visiting a site that likely hosts malware or phishing content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/roblox-website-robux-game-hack PDF link annotation
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/roblox-hack-download-2021-pc_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/quiz-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/roblox-hack-murder-mystery-2_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/cheat-bar-codes-for-roblox_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/pubg-uc-download_GM1330123889.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/hack-para-tener-robux-2021-julio_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
font_00_sfnt_off000030d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D7 22580 bytes
SHA-256: 55b29b49d241d85db56a0786a003dcb836eee6ee39f24f9d8f55eb4bd84d1539
font_01_sfnt_off00006347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 19048 bytes
SHA-256: 97836acc5fbafad7f52075bd973fc1ddd6b122b993e7f590483986b39f5f79de