Malicious PDF — malware analysis report

Static analysis result for SHA-256 a460e1db14c82e17…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 04:13:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dfbf5f1289f7938780c693763424d232 SHA-1: 2a510c074ab76e8d20288cc3e7874fde1a7179c9 SHA-256: a460e1db14c82e17dafbfed9d00e432eeabd48e1a0607374b29aa396a4137e38
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 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 https://netcdn.tw/app/431946152/free-robux-24-info-game-hack PDF link annotation
    • http://guimaq.com.br/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://guimaq.com.br/images/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://guimaq.com.br/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://guimaq.com.br/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://guimaq.com.br/images/tiktok-free-wala_GM835599320.pdfIn PDF document text
    • http://guimaq.com.br/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://guimaq.com.br/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://guimaq.com.br/images/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://guimaq.com.br/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://guimaq.com.br/images/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://guimaq.com.br/images/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://guimaq.com.br/images/roblox-azure-mines-cheats_GM431946152.pdfIn PDF document text
    • http://guimaq.com.br/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://guimaq.com.br/images/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://guimaq.com.br/images/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://guimaq.com.br/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://guimaq.com.br/images/how-to-get-free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://guimaq.com.br/images/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://guimaq.com.br/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://guimaq.com.br/images/how-to-get-cool-gear-in-roblox-free_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_004_off00004ea7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA7 27896 bytes
SHA-256: 9ca4a2456f5753b4c659838be45ccee90d3307a27846a97b44e1aff9def66f68
font_01_sfnt_off00008d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D48 18200 bytes
SHA-256: e3119aa5f3f2f21bb93e4c8693a04ce90afcfa3abc6a53ce98df24f8eb2edb2b