Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a91fb4fc7eccae…

MALICIOUS

PDF

32.0 KB Created: 2021-07-22 17:41:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: acac74b2b8a471329bb86147b95d485e SHA-1: 0a08a9425d2aa7b83242f08807d0d1fcd556debf SHA-256: 27a91fb4fc7eccae6323ffdb20eb23bfa15e8cf547be5d159ecdf3daa228320a
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent call-to-action to download a 'free Robux' executable. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and download lures indicates a phishing or scam attempt. The document's content and embedded links suggest it is designed to trick users into downloading malware by promising in-game currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.tw/app/431946152/free-robux-exe-game-hack PDF link annotation
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-ps4_GM479516143.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_off00002ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD5 21948 bytes
SHA-256: 8b3e0f38374cfc34d1b9ee3f6935ac44fdffbb9ef9bb013682e9f2cf87100809
font_01_sfnt_off00005b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B57 18200 bytes
SHA-256: 67527198e8f3e954f788e220fdc5e0efc04c24ca5928f64c044788dd6707c9fd

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