Malicious PDF — malware analysis report

Static analysis result for SHA-256 7540ecb026abb7f6…

MALICIOUS

PDF

47.3 KB Created: 2021-05-12 22:13:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6f72371f01895cfe73fbad4f46cedad4 SHA-1: f74228c38aed38c1f08585e3f468706e0240d038 SHA-256: 7540ecb026abb7f6ae38811bcc763976b462b37d8dcf8939a1cb82d54d11bf34
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document uses social engineering tactics, including a fake CAPTCHA and a "download" button, to trick users into clicking malicious links. The primary malicious URL identified is https://netcdn.xyz/app/431946152/robux-prices-game-hack, which is likely a redirector to a site hosting malware or phishing content. The document's content and heuristics suggest an attempt to exploit user interest in game hacks or free currency to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/robux-prices-game-hack PDF link annotation
    • http://poltekkesbanten.ac.id/e-lib/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A26 29080 bytes
SHA-256: c1dc982dde0cfe4105bccc2d3b14a2ecec71247df0a155d88bf362f812653ed3
font_01_sfnt_off00008d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4D 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off000096e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E7 18124 bytes
SHA-256: d6c4a79c1b877100ce6482b1b164fdc7adac613b1876b5752fde1291de88c7d2

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