Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b524249ce027af…

MALICIOUS

PDF

55.7 KB Created: 2021-06-09 06:57:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3c7d87b3bed0816ed92d4d7e249d7af5 SHA-1: 2158bfc14939e5c0430d4c05c1e2c406287e8d1e SHA-256: 51b524249ce027af0b477a347261c3201676136ddba7682b27ed994dc64e8a76
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 0.9718

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/how-to-get-free-robux-dis-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-com-free-gift-card_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/tofu-costume-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://Buy.HoaxMC.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000520c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520C 26228 bytes
SHA-256: 770e8d4720852e3aef003cb8dfa7ad3689f30b078607aefd7b87d165f1fc5d5f
font_01_sfnt_off00008ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED1 12800 bytes
SHA-256: db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
font_02_sfnt_off0000b6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AE 18568 bytes
SHA-256: acde06513b0e8dce3b1ba59aff7552e1d0e67df46e788247b9b55b753692b53b

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