Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5b458b0b4c35d7…

MALICIOUS

PDF

250.5 KB Created: 2021-07-05 00:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2597b269332a596073a5ee810b734e8f SHA-1: 9504864e01301710450e8e2dd227c2875664d80a SHA-256: 4c5b458b0b4c35d70f49bcd2ec5809c991c31b25e7639280615b8d3331499caa
140 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or scam lure, presenting a fake CAPTCHA and MFA prompt to deceive the user. It also contains an embedded URL pointing to a suspicious domain, likely intended to download a secondary payload or redirect to a credential harvesting page. The document's content and heuristics strongly suggest an attempt to trick users into performing an action that compromises their security.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/pubg-uc-to-rm-game-hack
    • https://domc.tw/upload/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://domc.tw/upload/files/roblox-cheat-codes_GM431946152.pdf
    • https://domc.tw/upload/files/pubg-uc-kaufen_GM1330123889.pdf
    • https://domc.tw/upload/files/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://domc.tw/upload/files/nuvos-hack-de-roblox-6-05-2021_GM431946152.pdf
    • https://domc.tw/upload/files/coin-master-hack-online-no-human-verification_GM406889139.pdf
    • https://domc.tw/upload/files/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • https://domc.tw/upload/files/coin-master-hack-software_GM406889139.pdf
    • https://domc.tw/upload/files/today-free-spin-coin-master_GM406889139.pdf
    • https://domc.tw/upload/files/coin-master-hack-ios-download-2021_GM406889139.pdf
    • https://domc.tw/upload/files/free-robux-codes-no-verification-2021_GM431946152.pdf
    • https://domc.tw/upload/files/pig-master-free-coins-and-spins_GM406889139.pdf
    • https://domc.tw/upload/files/free-robux-site_GM431946152.pdf
    • https://domc.tw/upload/files/coin-master-hack-2021-android_GM406889139.pdf
    • https://domc.tw/upload/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://domc.tw/upload/files/free-roblox-gift-cards-list_GM431946152.pdf
    • https://domc.tw/upload/files/hacks-for-de-oride-isle-sanatorium-roblox_GM431946152.pdf
    • https://domc.tw/upload/files/how-to-get-free-minecraft-coins_GM479516143.pdf
    • https://domc.tw/upload/files/how-to-hack-roblox-with-dll-njector_GM431946152.pdf
    • https://domc.tw/upload/files/free-spin-coin-master-hacktoman_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off00037cf6.bin
545be681e59105b32c16218260f20be536cefe156b505e30d765a6e7690dd72e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37CF6 26180 bytes
font_01_sfnt_off0003ba5b.bin
bd86232914e33de911ff8cd12df67bca38e8fcde7002321f51f45a4ba23e26ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA5B 18528 bytes

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