Malicious PDF — malware analysis report

Static analysis result for SHA-256 f757363a04028ffd…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 08:45:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6a0dcef91c3fe17927b64851fadd4bd1 SHA-1: db1ccef0b1eb057a9e708c7eebc549fa6454445d SHA-256: f757363a04028ffd1c6b8b2b2e1ea1859729d54d666458d1740368b890d121d0
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.online/app/431946152/roblox-free-draw-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-monster_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-and-coins-2021_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
font_00_sfnt_off00005072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5072 24136 bytes
SHA-256: a218643f1afcc24c8323543e6dd3c3f0c55e54101556d394922798299b411349
font_01_sfnt_off0000875a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875A 18508 bytes
SHA-256: d43aad8391cc92c6a460772e2941ce4b971725fdced8eeeb4fc6fe10188b1862

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