Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0396a9f90dc86a2…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 19:05:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f17257e1f8c888632688ae491422fbe SHA-1: b503b812268c0f67516dc640daeda40c928d0b33 SHA-256: a0396a9f90dc86a2921b06ff7e71cea0c375098f9da595c3be895a225e637016
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 0.9865

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.online/app/431946152/nuke-hack-for-roblox-game-hack PDF link annotation
    • https://cuc.ac.cr/userfiles/files/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/pubg-uc-vpn_GM1330123889.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/is-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-strategy_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/daily-free-spin-coin-master-link_GM406889139.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_off00004f28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F28 25936 bytes
SHA-256: 0522d2776fb387e8747e2f20f1a17070d046ba95673ac0114253f9a69a595bf7
font_01_sfnt_off00008b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B80 18488 bytes
SHA-256: 046f9ef497e838896f113a7d85cd0db756b541bfc7acd49ee4bf10297f7a6995

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