Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff6882a65ed42cc…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 11:03:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d547154b2b295168a0641f75a29220dc SHA-1: d20fe2cffe7814706d1e42cbacf6c98545e9580e SHA-256: 4ff6882a65ed42ccc391751b00ecbfd33fa00b19f2f0c44a55ed5b6ade24d4c9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering 'game hacks' or 'free generators', a common lure for malicious downloads. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful content.

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/406889139/coinmaster-rewards-game-hack PDF link annotation
    • http://picuruta.com.br/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://picuruta.com.br/images/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://picuruta.com.br/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/free-coins_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://picuruta.com.br/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-earn-free-robux_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_off00004617.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4617 27576 bytes
SHA-256: ee25bbdde5259b270f6268124334742be64da1075af2904c1a0dd15c51c731f4
font_01_sfnt_off00008533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8533 19136 bytes
SHA-256: 8ab976a5ab36896085791717c6a189cc241bd967059203b51e654662903c001a

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