Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ffadfc5433dbc9…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 01:08:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9dc6c9924664cfd53b3a92dc9438eaad SHA-1: fc7bdb4b3f2687880f82dfc0ffc1b0e8134db63b SHA-256: 23ffadfc5433dbc9e406d897ed59a3c9f255a3fb8426d2d6496a838cc66488fd
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 0.9980

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-for-kids-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-jailbreak-free-vip-server-link-in-description_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/games-like-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/robux-hack-2021-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-roblox-accounts-with-obc-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-alts-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-robux-getrobux-gg_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-shard-seekers-shard-hack_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-robux-using-hacks_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off00003158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3158 22480 bytes
SHA-256: 6621015bd59c487361a4d264ca174ddc299678e67702e76e0b389da573e44cac
font_01_sfnt_off000062f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 19280 bytes
SHA-256: 88c4455e0f78c2960f3f491dd25ca64faee621a531e5cc2b52a2398397ae986a

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