Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81d9648bde8ced7…

MALICIOUS

PDF

34.7 KB Created: 2021-06-27 18:28:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 93cbf759da1d3d97caa112360c1f8137 SHA-1: 09a150f8fd4d0cecc19cf55c38056e7379255c5c SHA-256: a81d9648bde8ced74caa23ab2ff37b1511730a8537d7139c9fd27975b02d9727
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a document body promoting free Robux and game hacks, indicating a lure for users to download potentially malicious applications. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links further supports this assessment. The primary attack vector appears to be users clicking on these links, leading to a potential download of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/free-robux-sans-verification-game-hack
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/free-spins-coin-master-no-survey_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/roblox-hacked-client-comlu_GM431946152.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/how-to-hack-somebodys-roblox-account-2021_GM431946152.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/free-robux-gift-card-codes_GM431946152.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/hack-pour-obtenir-robux-gratuitement_GM431946152.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-group_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-links-free-spins_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-android_GM431946152.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/rbx-free-robux_GM431946152.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-free-spin-whatsapp-group_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/how-to-create-group-in-coin-master-free-spins_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/free-robux-cards_GM431946152.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/roblox-2021-hack_GM431946152.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-hack-app-link_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-hack-without-verification_GM406889139.pdf
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-card-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030ab.bin
aa8990d9f961537462f369684fffe5acb7c0dadcff662183a3b49b1185148e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30AB 22320 bytes
font_01_sfnt_off0000629e.bin
b3c0faad282a89aaeef7bfc7c276a5abb60715ad0689899d4332e660990a4e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 19072 bytes

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