Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf773efe48a9fbd3…

MALICIOUS

PDF

32.4 KB Created: 2021-07-19 06:06:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9feec7689347bfc9ca8e346a9e124cc3 SHA-1: e20bb0dee6b54042d2dab5d4e4d91309351e97a0 SHA-256: cf773efe48a9fbd36486d7232e2482e34eb3c30668e216763928521bbb2d979c
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document body and embedded URLs strongly suggest a lure for free in-game currency (Robux), a common phishing tactic. The ML classifier also flagged this PDF as malicious with high confidence. The presence of multiple related URLs indicates a potential campaign distributing these lures.

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/hacks-to-get-free-robux-game-hack
    • https://magistrinfo.ru/images/free-tiktok-bots_GM835599320.pdf
    • http://magistrinfo.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://magistrinfo.ru/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdf
    • https://magistrinfo.ru/images/minecraft-account-hacked_GM479516143.pdf
    • https://magistrinfo.ru/images/minecraft-for-free-on-phone_GM479516143.pdf
    • https://magistrinfo.ru/images/free-tiktok-likes-generator_GM835599320.pdf
    • https://magistrinfo.ru/images/robux-com-free_GM431946152.pdf
    • https://magistrinfo.ru/images/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://magistrinfo.ru/images/coin-master-free-spins-daily_GM406889139.pdf
    • https://magistrinfo.ru/images/free-views-on-tiktok_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000297f.bin
a3812a3081381c0396ee741a4ef26093b0ed25bbbcef7c1f9ec8e8b76c58b9d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x297F 22300 bytes
font_01_sfnt_off00005b13.bin
bdc8e99d9ea86ba376637a879a21a019c14cea55b1de89ae0d751e78f755b63e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B13 18700 bytes

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