Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20f12a79e6f5cbc…

MALICIOUS

PDF

50.2 KB Created: 2021-06-08 13:19:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 820348620d030d311930011dffcdbbac SHA-1: aa24b58a510c6cdea5fe044c0e362cec073b9569 SHA-256: c20f12a79e6f5cbc3fde72850435b5e5d09d65aa3c936409e343e7b566a39599
102 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Free Robux' and impersonates a brand (iCloud) with a mismatched link host, indicating a credential phishing or malware distribution attempt. The presence of external URIs and the ML classifier flagging the PDF as malicious strongly suggest malicious intent. While no scripts were explicitly extracted, the document structure and embedded URLs point towards a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

Heuristics 5

  • 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.tw/app/431946152/free-robux-card-codes-not-expired-2021-game-hack.
  • 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 https://netcdn.tw/app/431946152/free-robux-card-codes-not-expired-2021-game-hack PDF link annotation
    • http://io24.com.ar/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/tiktok-free-download-2021_GM835599320.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-catalog-items-roblox-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/plaay-roblox-free_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/como-ser-hacker-en-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/cheats-for-getting-money-in-roblox-meep-city_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-free-shirt-not-model_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-hack-for-wls3_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D1 27936 bytes
SHA-256: 9afbf9dee3613caaaa663d545cba18988a80f7c729ac809034ca1a6117a4b34c
font_01_sfnt_off000094e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94E4 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00009e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7F 19216 bytes
SHA-256: 35b0e2f78b644ce27172f0bce18c9fd450852f9ac526525909cb68af34209b27

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