Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ca99f27507faf9…

MALICIOUS

PDF

44.0 KB Created: 2021-05-11 22:31:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 32716fc786312fbf174def2e19370637 SHA-1: ccfe59f7930bcea92dcb421bc7b3448617a5344a SHA-256: 99ca99f27507faf95a81b0cb5a0df76020a62e40a1fa8723849f42c99e99fdaa
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a heuristic firing for a 'free generator / game hack' lure, specifically mentioning 'Free Robux'. The document body, though partially corrupted, also contains references to these lures and external URLs. This indicates a social engineering attempt to trick users into visiting malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-no-human-verification-no-survey-game-hack PDF link annotation
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • http://elearningmtsn2kotatasikmalaya.com/__statics/gudangsoal/files/coin-master-free-cards-link_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_003_off00004db9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB9 25172 bytes
SHA-256: 0d6e074bbfed81eea440d064d756f29b9e93d20374d3dab9a2eb55bb9bb1dff2
font_01_sfnt_off00008749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8749 19156 bytes
SHA-256: 339d1e55aee7c6169fc9e26e1541ea9d6c779f781f53a8c1d652dbe4fbeac478

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