Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aec8d0bfa6dd651…

MALICIOUS

PDF

44.2 KB Created: 2021-06-02 12:11:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1c3962a58af9109e82ba7c3c1d165e41 SHA-1: 1d596cb23e6ab1a1d0b41b1ac20247a9f3a83a55 SHA-256: 3aec8d0bfa6dd65167a7cb9fc234517db027c3d609531cef03987bc18f3aaf0d
62 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and a document body that lures users with promises of free game items, such as 'Free Roblox Clothes'. The presence of a 'callback lure' heuristic suggests it may also employ a pretext for support or billing scams. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to lead to a download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.xyz/app/431946152/free-roblox-clothes-for-girl-game-hack
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-daily-free-spins_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-hack-version-download-2021-android_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/mobihack-net-roblox-hack_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-make-roblox-clothes-for-free_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/roblox-pink-free-robux_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/tiktok-followers-for-free_GM835599320.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-on-iphone_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-spin-hack-trick_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-rewards_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-apk-mods-coin-master_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/clean-master-free-coins-and-spins_GM406889139.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/pokemon-go-free-pokemon_GM1094591345.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/free-robux-card-codes_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/robux-free-2021_GM431946152.pdf
    • http://www.vivaahsathi.com/uploaded_files/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f26.bin
5686da3a394d410d6eab5794408ac8211ea95ea7bc689be2f95c8568818c94cf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F26 25908 bytes
font_01_sfnt_off00008a06.bin
d29ec2e71bb068e77f351b4d123c990b41e31d257b9d9cf8b177703eed95a4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A06 18340 bytes

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