Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f8b9083ec2b31b…

MALICIOUS

PDF

43.4 KB Created: 2021-06-11 08:52:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 70b688bf0fa4a7d2debb216253403819 SHA-1: af05a8223c07161bb7c0a61e75cbcf9f56327296 SHA-256: 11f8b9083ec2b31b90cbf2793eaf5337200c4a387374e2b8fdda1dd64d9afc74
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/roblox-tp-to-me-hack-game-hack PDF link annotation
    • http://empresa-venta.hr/files/how-to-get-roblox-items-for-free_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/working-coin-master-hack_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_004_off00004e1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E1C 24428 bytes
SHA-256: 91b37892a22e7a12b5cfa27af028eb97ceabfe9470b84f5c3466a8fee2fd3653
font_01_sfnt_off0000862b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x862B 18556 bytes
SHA-256: a7e35ff090e19261fa2c68c2d69676bcd21b5716b7511b53fdb0ac034d7c0d10

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