Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef39e6125e41d9a3…

MALICIOUS

PDF

34.5 KB Created: 2021-06-19 19:31:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4eff02c8af2750616b454bda56ec25f7 SHA-1: 5f0aea0d71a9aa03bdd0f69295821e2830d8ec28 SHA-256: ef39e6125e41d9a3b4d177588663d0aa2c03262dbb2efa24585b331b8aefba0a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a high-risk heuristic indicating it links to a 'free generator / game hack' redirector, specifically http://netcdn.co/app/431946152/how-to-get-free-robux-very-easy-and-fast-game-hack. This lure is designed to trick users into visiting a site that likely hosts malware or phishing content. The ML classifier strongly supports the malicious verdict.

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 http://netcdn.co/app/431946152/how-to-get-free-robux-very-easy-and-fast-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/get-your-free-robux-today_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-speed-hack-on-roblox-with-out-shutdown_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-cheat-aimbot_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-codes-2021-real_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
font_00_sfnt_off00002e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4E 22460 bytes
SHA-256: 5ed475e1761bbf05395abc9e77918fcc0012352ae4552a17c44436f6000e501f
font_01_sfnt_off0000604d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 19472 bytes
SHA-256: f7daff48947b188c41f8e20d5c1c2340b45df9bfd4f29b32c84f33a3f9a86704

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