Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5d77817453bf16…

MALICIOUS

PDF

32.4 KB Created: 2021-07-19 01:45:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 295cd8e922ecbfadc8199a24c82e4b70 SHA-1: 8af0398fc76f36cb0f10e258e0da7fa32149f5f9 SHA-256: 4b5d77817453bf1692ed8b1e993afcac60365e935cd27c452ac0f3fea1becb08
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document body and embedded URLs indicate a lure for free Robux, a common theme in phishing and scam campaigns. The presence of multiple related URLs suggests a campaign distributing links to potentially malicious sites or further downloaders. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious intent to redirect users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9582

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/how-to-get-free-robux-easy-2021-game-hack
    • http://lakeshistory.com/images/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdf
    • http://lakeshistory.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://lakeshistory.com/images/robux-hack-tools_GM431946152.pdf
    • http://lakeshistory.com/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://lakeshistory.com/images/free-robux-codes-2021_GM431946152.pdf
    • http://lakeshistory.com/images/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000028dc.bin
e592d80744cd9a139133679cd52bbcdde3e8935c22903407718e1c3049d589bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28DC 21976 bytes
font_01_sfnt_off00005974.bin
9f22d9eedc59cc6147a13ff82aa3768ba2a0c9b9a35b2047936220c7f40e5b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5974 19276 bytes

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