Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3982d6919c00df…

MALICIOUS

PDF

43.4 KB Created: 2021-05-11 01:02:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b07b9a37fc52a3472e0791a5d14a3f07 SHA-1: 119c1a88d70b25d70fa410067573281b3e12ec20 SHA-256: fb3982d6919c00df9e352e8ba5813912b46b1b5355fe482cb00d33bb94911c42
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 0.9969

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/406889139/coin-master-game-free-play-online-game-hack PDF link annotation
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-mod-coin-master_GM406889139.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_off00004c51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C51 25936 bytes
SHA-256: 761e35f97f14d0282c7ea9d648fca7a05cd42d4d92959770a16119055c6ebd6c
font_01_sfnt_off0000873e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873E 18380 bytes
SHA-256: b5bbbc623ea736b659451b361c4225dcdb8ece8dfba16a3ff4312aad2e8470ed

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