Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d7eeae22c0dd6a…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 04:44:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c8239f994f6d4bfc3f586e42f97a07d8 SHA-1: 44f5f0deb3ee0d4257271d8b92e5891f6274c3ec SHA-256: 33d7eeae22c0dd6a7e12727462d4532cbc2bf8cad5dd3b72f2fc5632fc21a2a4
82 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including invisible ones, that lead to CAPTCHA-themed lures and potentially malicious sites. The document body and extracted URLs suggest a scam related to free in-game currency or hacks, aiming to trick users into completing verification steps that likely involve credential harvesting or malware download. The ML classifier strongly indicated maliciousness, and the presence of external URIs and CAPTCHA lures supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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 http://netcdn.tw/app/431946152/free-robux-without-verification-or-survey-game-hack
    • https://dentmate.com.tw/image/data/files/how-to-hack-roblox-admin-2021_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/free-robux-generator-no-survey-or-captcha_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/how-to-hack-roblox-account-cookie_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/how-to-get-free-bc-on-roblox-2021_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/free-roblox-account-getter-v3rmillion_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/hacks-roblox_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/play-minecraft-pocket-edition-for-free_GM479516143.pdf
    • https://dentmate.com.tw/image/data/files/how-to-get-free-black-wings-in-roblox_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-using-your-phone_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/how-to-hack-robux-on-robux-2021_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/win-free-robux_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/skyline-reviewed-roblox-hack_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/roblox-font-free_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/free-account-roblox-with-robux_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/get-free-spins-coin-master-link_GM406889139.pdf
    • https://dentmate.com.tw/image/data/files/coin-master-apk-hack-2021_GM406889139.pdf
    • https://dentmate.com.tw/image/data/files/filter-roblox-hacks_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdf
    • https://dentmate.com.tw/image/data/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • https://dentmate.com.tw/image/data/files/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f54.bin
1773b6d22b3eddbb9bb01fbcb54e0a2d8f482e7e414d8a390c52fd695029e7b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F54 22116 bytes
font_01_sfnt_off0000608e.bin
2b0675f33db550cd9a8e3dc1ba0bd2c431e10f6529817ff9c59fda3edd6e12a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 19732 bytes