Malicious PDF — malware analysis report

Static analysis result for SHA-256 291cd3a5d3f99aff…

MALICIOUS

PDF

50.0 KB Created: 2021-06-11 01:12:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5ee731ed10f55d7b7a9744322f186d12 SHA-1: 2f05cfd438ac98b9c2eab5eb6b996e8af89f5916 SHA-256: 291cd3a5d3f99aff73c211f15ca4cf846654eae4ef491895ebacdf961e2bc984
102 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating a fake CAPTCHA and a visual download lure, suggesting a social engineering attempt to trick the user into downloading a payload. The embedded URL points to a resource related to game hacks, reinforcing the lure. The document's content and structure strongly suggest it's part of a phishing or scam campaign designed to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/mad-factor-mad-city-hack-roblox-game-hack
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/robloxmatchcom-free-robux_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/my-roblox-account-was-hacked_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-games-like-coin-master_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/no-human-verification-hack-for-coin-master_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-in-roblox-using-a-phone_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-exploits-for-roblox_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/roblox-g_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/roblox-free-hair-boy_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-robux-no-verification-no-download_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/coin-master-free-spins-through-coin-pop_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/minecraft-hack-mod_GM479516143.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-robux-images_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-minecraft-server-maker_GM479516143.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-roblox-accounts-dantdm_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054c4.bin
ef8c3443945f0d4b55b49462f55f071539abc3dc4472425f25deb852bc30a3ef		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54C4 27044 bytes
font_01_sfnt_off0000941f.bin
15fa605262285dfa73b694d259bab9c45b3003b991993000b226b6edb761bd99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x941F 2984 bytes
font_02_sfnt_off00009e73.bin
cded03317fec0c0e279b2dde07e69e5a991a1a81fa2113fb576d043beaea77a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E73 19120 bytes

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