Malicious PDF — malware analysis report

Static analysis result for SHA-256 21834088173bb322…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 18:07:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 71e02aef147a36192551903db076255b SHA-1: bf135e9bac4b0d7bea479d839ff6931453d67811 SHA-256: 21834088173bb3221e18dc83089c511c6d9faa15a40ae3e022a05433858a6767
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a fake CAPTCHA and a "download" lure to trick users into clicking external links. The presence of multiple URLs, including one pointing to a potential exploit or malware download site, strongly suggests a malicious intent to redirect the user to a compromised resource. No scripts were extracted, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/free-roblox-outfits-2021-game-hack
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-download-coin-master_GM406889139.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-come_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-apk_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/minecraft-pocket-edition-hack_GM479516143.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/abd-roblox_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-20-free-spins-link-today_GM406889139.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-today_GM406889139.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-rewards-free-spins_GM406889139.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-spins-coin-master-november-2021_GM406889139.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/robloxheroxyz-free-robux_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/robux-fun-hack_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-get-free-cards_GM406889139.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/hacks-for-roblox-prison-life_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/earn-robux-com_GM431946152.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/today-free-spin-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049f8.bin
36a3dd9dbf4c29385dfd2a9c6fa0d015e5b8711ae8b0a85bbfcec148053701d1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F8 24568 bytes
font_01_sfnt_off00008288.bin
08924b32c91b27fd5bb3b33addbb65fc5755536ddb9ff57fccc382b8f67ce437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8288 18712 bytes

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