Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d2e6408d024b10…

MALICIOUS

PDF

44.2 KB Created: 2021-05-11 18:03:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c5c7f2ade7cd7b285ba59a0e6ebf2db7 SHA-1: 4ebdac9d9a8359442769b5be9e22bd1b1595abc0 SHA-256: a2d2e6408d024b10eceaee4008cff9325ad04aa35eb5e55e320a9f98ada9a9dc
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and links to external URLs that are likely part of a scam or phishing operation. The ML classifier strongly indicates maliciousness, and the presence of multiple game-hack related URLs suggests a common lure for credential theft or malware distribution. No scripts were extracted, but the document structure and embedded URLs point to a social engineering attack.

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-verifying-2021-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-hack-2021_GM431946152.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_off00004b08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B08 26188 bytes
SHA-256: 8b7fca9fd51b25984bad7c2a564cfd0224e8c863c16663eb703487f4248b9d8f
font_01_sfnt_off00008618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8618 19772 bytes
SHA-256: 854662d4ed02eaea1b0a0020fc7ac25fa5b331288bf96b43491be4028b138ed1

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