Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a049c554e90d16…

MALICIOUS

PDF

43.2 KB Created: 2021-05-16 23:22:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ca67a32f588074bd22f0fa0fc57e2d6d SHA-1: 2aa203a49149b556249e72f489c87de88a083821 SHA-256: 71a049c554e90d16b608f0008058cfcb59a3922bf667b71e484e1141ff211d72
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The document exhibits characteristics of a phishing lure, specifically targeting users interested in game cheats and hacks for titles like Coin Master and Roblox. It contains a prominent external URL and multiple embedded URLs pointing to potentially malicious download sites. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to solicit sensitive information, such as private keys or passwords, under the guise of game-related downloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/coin-master-apk-hack-3.5.8-game-hack PDF link annotation
    • http://butkimloai.com/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://butkimloai.com/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://butkimloai.com/images/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://butkimloai.com/images/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://butkimloai.com/images/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://butkimloai.com/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://butkimloai.com/images/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://butkimloai.com/images/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://butkimloai.com/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://butkimloai.com/images/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://butkimloai.com/images/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://butkimloai.com/images/coin-master-hack-apk-facebook-login_GM406889139.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_003_off00004bec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BEC 25800 bytes
SHA-256: f6622cd7a9dbb2baa330417b31ec23cc2817d5c2c62b0f826b018c9b7caf50ab
font_01_sfnt_off000085e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E1 18476 bytes
SHA-256: b9b6adf449100deb59ed95ea3ad5e02aaf3681432d01b6b7dc02955a5f5017fc

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