Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cf9cf9b59cf444…

MALICIOUS

PDF

42.3 KB Created: 2021-05-15 02:11:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b5f3148dec70e5bbfe1f99bc4b25e038 SHA-1: cab2d7fff9b08c3d7a90e84b0f0d2c064531e322 SHA-256: c5cf9cf9b59cf444346b1c0d2fee9365a73e3d4f3daf3fb2ea61f9d8030ec113
140 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, impersonating brands like Facebook to lure users with offers of free Robux or game hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a visual download button further supports a phishing or scam attempt. The document's primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/uprobux.com-free-robux-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
  • 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/uprobux.com-free-robux-game-hack In PDF document text
    • https://academy.cr/images/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://academy.cr/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • https://academy.cr/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • https://academy.cr/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/free-robux_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://academy.cr/images/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • https://academy.cr/images/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://academy.cr/images/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • https://academy.cr/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://academy.cr/images/mathep_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://academy.cr/images/coin-master-games-hack_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_off000045b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45B1 25720 bytes
SHA-256: 14fe5f88c45a42065334629cc8ce4cf601b26b17dd3eef8698b649360e810cac
font_01_sfnt_off000081eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EB 18700 bytes
SHA-256: 143ab518bfe1873128e001b27a68cdab9711d8d723564be581f3f50f35f3a2b6

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