Malicious PDF — malware analysis report

Static analysis result for SHA-256 b605a778d2d20662…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 09:56:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 237054914dfdb441b5de9a499eee3fd2 SHA-1: 487de548c534264539ce0aa988ecf7219a52a469 SHA-256: b605a778d2d206624bc95ac53821e1f960fd5f036fb3df1e12b853b6e030a521
62 Risk Score

Malware Insights

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

This PDF document, generated by wkhtmltopdf, contains numerous embedded URLs pointing to sites offering game cheats and free in-game currency, such as 'coin-free-master-game-hack'. The ML classifier strongly flagged this PDF as malicious, and the presence of these links suggests a phishing or malware distribution attempt. The document body and heuristics indicate a lure for users to download files, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.tw/app/406889139/coin-free-master-game-hack
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-executor-free-download_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-ios_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-generatere_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-mac_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/rblx-gg-free-robux_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/best-roblox-hacker-names_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/pokemon-go-free-yveltal_GM1094591345.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-hack_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-fan-free-games_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-coins-and-spins_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/rbx-gg-free-robux_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/claim-free-spins-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-generator-2021-download_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/robux-generator-no-survey_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-on-ipad_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-apk-hack-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031cc.bin
fb1edaff57477307ff46cec667528d4ccbe3117649e7d5b6d0f9aced68f8e023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31CC 22564 bytes
font_01_sfnt_off000063de.bin
bf578f527c18d7e48f73a9cd7a871d764ef0a45aefce568ff80db22f3a343b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 17996 bytes

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