Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64ec8bf85524803…

MALICIOUS

PDF

43.7 KB Created: 2021-06-07 21:49:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b73c54d8fd70456e92cea3930290c721 SHA-1: 69c3ac4e824a80ff297f5bad19e11643b464c182 SHA-256: a64ec8bf85524803eeb7530f845cd60d66e58adb360afce5b2d84604f51380ba
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/nicsterv-roblox-how-to-get-free-robux-game-hack PDF link annotation
    • https://www.romedia.gr/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.romedia.gr/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.romedia.gr/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • https://www.romedia.gr/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • https://www.romedia.gr/images/roblox-free-models_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.romedia.gr/images/how-do-we-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • https://www.romedia.gr/images/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • https://www.romedia.gr/images/best-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/minecraft-hacked-client-112-2_GM479516143.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_off00004f06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F06 24788 bytes
SHA-256: f4b18bbea9061eaa2fb2024d1756f5b7487c2d8018d15ba7549e05b0c87947ec
font_01_sfnt_off00008733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8733 18592 bytes
SHA-256: 4aff429fe1b119e7f098639142a0f00d6508a75b408738cae4d1ab1c5d696e00

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