Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aa19d2af03c870…

MALICIOUS

PDF

53.0 KB Created: 2021-06-11 07:03:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1cbe76ae1e6404bffe108f658fbd2875 SHA-1: 70249184cc1ee2b43c2102cca625791ba72e3c68 SHA-256: 79aa19d2af03c870f0d7fa31edaea29d22c6957b9b9b3f3aacac0984fd9e8474
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF link farms. The document body and extracted URLs suggest a lure related to game hacks and cheats, with a critical heuristic firing for a 'Recovery secret / private key request'. This indicates a high likelihood of a phishing or credential harvesting attempt, potentially leading to malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

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.
  • 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.tw/app/431946152/f12-hack-roblox-game-hack
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/safe-hack-for-coin-master-android_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-hacking-news_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-can-u-get-free-robux_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/hacked-accounts-of-roblox_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-in-app-purchases_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-long-is-the-minecraft-free-trial_GM479516143.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-script-executor-roblox_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-robux-no-email_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-roblox-account-generator_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-hacks-xyz_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-coins-coin-master-2021_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-get-vip-for-free-vampire-hunters-2-roblox_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000551b.bin
306b0f3f3060475b0876592c15cbd23bb3fd13463a6b04794f87569042846c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x551B 26404 bytes
font_01_sfnt_off00008f5a.bin
8e24205afdd13dcdea98f8150ef77dee4030e0e50a7c748783d1b4598e034a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5A 3464 bytes
font_02_sfnt_off00009b8a.bin
62075f0fe13502d46afb6e55e83d440c29ef4988399537df1f86e7653ce3b744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8A 6636 bytes
font_03_sfnt_off0000ab97.bin
b8ae7dcfb9322d05b78bffca4630fb1184d77c99271bafbe4529b7019f925a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB97 18576 bytes

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