Malicious PDF — malware analysis report

Static analysis result for SHA-256 010b2011c8fdceb1…

MALICIOUS

PDF

46.5 KB Created: 2021-06-04 00:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 67d44d4fcddddfa131c3bff9210431c0 SHA-1: 140ffeb4e2658a3fccbc043d4d7ef0f20476c5d7 SHA-256: 010b2011c8fdceb13e7c95df46dae4ce0249ad8710ea767d9e9a6732f358f3a5
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a prominent link to a website promising free Robux, a common lure for scams. Heuristics indicate the document displays a fake CAPTCHA and instructs users to disable security software, further supporting a malicious intent. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.online/app/431946152/claim-free-robux-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/more-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-items_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/noob-vs-pro-vs-hacker-vs-god-roblox-bloxburg_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pokemon-go-free-and-home-transfer_GM1094591345.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005464.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5464 27084 bytes
SHA-256: 73ecb12b2eb092c54d4b2e1913b15bd49b838ee8448051b91e2968a160eeb3fe
font_01_sfnt_off0000923c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x923C 18696 bytes
SHA-256: 5cf9f9319346d61d0cee7eea738a99b5b91b4687cc89c43f6f5509699f250cff

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