Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6f5c845e98a4b1…

MALICIOUS

PDF

50.6 KB Created: 2021-06-03 07:50:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ca671eab40fc23736f5fa5f0eced4959 SHA-1: 4fa0fd13b8358091ac77186dbee04c5e1e2c0899 SHA-256: 3d6f5c845e98a4b1d5e8f73b88c5aff0078d8c3c45dfdcf2b7fec9d8618de92f
62 Risk Score

Malware Insights

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

The document contains multiple embedded URLs and a prominent external URI pointing to a download for a game hack, suggesting a lure for users seeking in-game advantages. The presence of a callback lure for billing or refund issues, combined with the download button, indicates a potential phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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 https://netcdn.online/app/406889139/coin-master-unlimited-spins-apk-free-download-game-hack
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-without-verification-2021_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-survey_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/hack-coin-master-no-verification_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-coin-master-spins-2021_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-promo-codes-may-2021_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-clipart-free_GM479516143.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-xyz-apk-download_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/haktuts-coin-master-hack_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-real-working_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/www-coin-master-hack-tk_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-hack-game_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/50-000-free-spins-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-spins-coin-master-daily_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-version-apk-download_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-adopt-me-free-pets_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005274.bin
8d4321c7107072689c0d0963d0511a7726113908f8ec303dabe487a39d945dbe		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5274 30292 bytes
font_01_sfnt_off00009729.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9729 2840 bytes
font_02_sfnt_off0000a0db.bin
c2d82cd4a12004e31f0bd3c8b1caf06db58ba118ed59957898480102bbe81bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DB 19084 bytes

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