Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf6cca9358c3e07…

MALICIOUS

PDF

43.2 KB Created: 2021-05-15 03:36:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8d5dbce7760ec6b390fdb18f588c77fc SHA-1: 9ab5fcdb2fb32c895cf708398ed5f49301baad00 SHA-256: eaf6cca9358c3e07c429b91f407950fe18c02d66d241cfd75d5ffe68015342e4
82 Risk Score

Malware Insights

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

The PDF document contains a lure for free in-game currency, directing users to a suspicious URL. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a security bypass instruction suggests an attempt to trick the user into downloading and executing a secondary payload. The document body itself is heavily obfuscated and contains references to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/rbl-gg-free-robux-game-hack PDF link annotation
    • https://sunnygarden.com.tw/image/data/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-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
stream_003_off000046aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46AA 27212 bytes
SHA-256: 1f9c038918f6d0181d82b0457dcc18da9fe534933f4f88ffecc419dfabc7c69f
font_01_sfnt_off00008637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8637 18376 bytes
SHA-256: 36d8e5c8df31ce5774558eb4dff236d908794f1052653b7bf9d7a2310610d2b4

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