Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e990803120be1f…

MALICIOUS

PDF

44.4 KB Created: 2021-05-14 19:55:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b1c9d6918958f08160b06cf3c90a4875 SHA-1: af87862d1fe44e5def5a004aa44deca4c312d525 SHA-256: 76e990803120be1f6407fa277cdb29f32afc128de0e517bab0ddc1fea90c365a
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA to trick users into interacting with it, likely to download a secondary payload or redirect to a malicious site. The embedded URL and numerous other URLs found within the document point to potential download locations or scam pages related to games and free items. No scripts were extracted, but the PDF structure itself contains links that facilitate the malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 4

  • 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
  • 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/406889139/free-spin-coin-master-today-game-hack
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-robux-offers_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/smart-lodhi-coin-master-hack_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-robux-please_GM431946152.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-email-rewards-link_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-minecraft-gift-codes_GM479516143.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-spin_GM406889139.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/real-robux-codes_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-robux-place_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-spins-coin-master-no-survey_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/roblox-zone-free-robux_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/minecraft-116-apk-download_GM479516143.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/robux-win_GM431946152.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-com_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/best-hacked-client_GM479516143.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/get-robux-com_GM431946152.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/minecraft-hacks-115-2_GM479516143.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/minecraft-free-play-no-download_GM479516143.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/minecraft-hacks-ps4_GM479516143.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/roblox-gift-card-online-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048c9.bin
981aa52bf8ae0003075ca4d2dd39baddc258fcf0b2978c03adb0e3e06c982e1c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C9 24532 bytes
font_01_sfnt_off000080ee.bin
d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EE 2868 bytes
font_02_sfnt_off00008ad9.bin
75d5000e8f1c13244b223f0a61b12b9b535d128d76c8bd265699ae4a18287ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD9 18240 bytes

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