Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb731a11fa59402…

MALICIOUS

PDF

43.1 KB Created: 2021-06-13 23:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9c8d4c0528687c87e5e17ee73dc71cf6 SHA-1: 7c0b0dbbb444735cbe6b0dbbc5f27d5b43ea8d58 SHA-256: bcb731a11fa59402848842305863a890d0930593d64fa7bef216acc6828ae9ea
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a visual download button lure, all related to obtaining free Robux or game hacks. The ML classifier strongly flagged this PDF as malicious, indicating it likely serves as a lure to download a second-stage payload. The document's content and heuristics suggest a phishing or social engineering attack aimed at tricking users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/roblox-sunset-city-how-to-sell-furniture-no-hack-game-hack
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-to-get-free-robux-without-waiting-now_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/robux-hack-2021-apk-download_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/gamingultra-roblox-hack_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/free-robux-website_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/roblox-online-generator-free-robux_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/como-hackear-cualquier-juego-en-roblox_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/roblox-speed-hack_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/coin-master-spin-free_GM406889139.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/free-spin-in-coin-master_GM406889139.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/minecraft-free-play-no-download_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/get-free-robux-without-sighning-in_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-to-hack-an-acount-on-roblox_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/free-robux-hacks-no-verification_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/hack-para-roblox-robux-gratis-2021_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/free-minecraft-resource-packs_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/is-minecraft-free-on-pc_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/get-free-robux-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c2a.bin
80eed0264ff2439487033b8ec08faf9c18ce259036d958fd0bfedb16725ff37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2A 25008 bytes
font_01_sfnt_off000083fb.bin
904256b36282b144816d67a98b18453e3ec4bb116dc4a8f30b5d81098b48c002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FB 19056 bytes

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