Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a164b6a385c29fb…

MALICIOUS

PDF

48.0 KB Created: 2021-06-07 04:07:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a95f8110c8297b5b87ae8ddaea652bab SHA-1: 496dcdfe41319c0b97f3fa3143538ac588fc67f0 SHA-256: 3a164b6a385c29fb0b006d6b8c01e55dbfe59d02199384491039dd8f751107b2
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a call-to-action to download 'free Robux', which is a common social engineering tactic. The embedded URL points to a domain known for distributing potentially unwanted or malicious files. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/free-robux-promo-codes-july-2021-game-hack PDF link annotation
    • https://hotelartskathmandu.com/userfiles/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/tiktok-free-folowers-online_GM835599320.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/roblox-vampire-hunters-2-wall-hack-how-to-do-it_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51D6 29412 bytes
SHA-256: 63d11f3c818fde22390f7e4f264a36ee0a4600cf4c9a814ae189a2f411d27edf
font_01_sfnt_off00009611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9611 19424 bytes
SHA-256: 77311ed1b84682b00755145690e3bae59cb065f0a147f7662c949a23c90dc48b

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