Malicious PDF — malware analysis report

Static analysis result for SHA-256 a420f0a488434d4a…

MALICIOUS

PDF

45.7 KB Created: 2021-05-19 13:33:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b3248b87e1d5ba101b0ce3db532d3484 SHA-1: 5a4b3347cdcbad8657a7e91a89512335d4e4b6d1 SHA-256: a420f0a488434d4a11f5107148fc738b4f2eda6082862f1490dabcefa65d7610
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for 'free Robux' and 'game hacks', impersonating Microsoft. It directs users to a malicious URL, https://netcdn.xyz/app/431946152/roblox-studio-free-download-game-hack, which is likely intended to deliver a payload or phish for credentials. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/roblox-studio-free-download-game-hack.
  • 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/roblox-studio-free-download-game-hack PDF link annotation
    • http://grupodin.com.br/images/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/2021-roblox_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/can-you-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn 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
font_00_sfnt_off000048a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48A5 24920 bytes
SHA-256: f573c0d23c0040180eb41bce200813f68e735a4edccb86655d4ed3882a7ce4e1
font_01_sfnt_off0000824d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x824D 3472 bytes
SHA-256: fc29aa3b5568d1de631919fae7fa44e7c5c4022893b4247ec0b58f35b84ca648
font_02_sfnt_off00008dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD1 19048 bytes
SHA-256: 285731f73243192995ef55c7bff5b12d0277a9b461a1d4b1bbd56785699d0c43

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