Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7ae222a1b70d40…

MALICIOUS

PDF

32.7 KB Created: 2021-06-25 11:47:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eb87ef71458d405172ee29bd8c62212c SHA-1: 2e86672a563187c405f116f1d0fc67842d238c77 SHA-256: cb7ae222a1b70d40719f99bf28ed90271bb05d98f2dfa72d286932f10cc2216a
122 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a document body that lures users with promises of game hacks and free currency for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/contact-roblox-account-hacked-game-hack
    • https://jormix.co.id/ckfinder/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/free-spin-coin-master-link-download_GM406889139.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/pig-master-free-coins-and-spins_GM406889139.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/v3rmillion-hacks-roblox_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/free-robux-generator-that-actually-works-no-human-verification_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/daily-free-spins-coin-master-app_GM406889139.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/robux-free-illimited_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/hack-de-robux-al-instante-gratis_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/free-robux-gift-card_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/easy-robux-com_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-twitter_GM406889139.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/free-robux-hack-us_GM431946152.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-daily-spin-free_GM406889139.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/hack-coin-master-net_GM406889139.pdf
    • https://jormix.co.id/ckfinder/userfiles/files/robux-hack-link-in-desc_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002afe.bin
e77109d2340d6f56835bddae33224c295e6746d02ecae10e6b16406844976d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2AFE 21652 bytes
font_01_sfnt_off00005ab0.bin
e55d2a5444f6d35cb15f9942d84600ac4e0a1bd159d7ffd7ae2a4de22ae39366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB0 19072 bytes

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