Malicious PDF — malware analysis report

Static analysis result for SHA-256 253ca0d969cdcbf4…

MALICIOUS

PDF

251.5 KB Created: 2021-07-05 09:18:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6efb3ed1c0f5da9da13303fd39ac7a45 SHA-1: 2b2db08588a1ad1ae441d5a0eca1359e9c125ea4 SHA-256: 253ca0d969cdcbf4ef242d1bdef5504c719272dba7e700e50755c8952006122e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple lures, including a fake CAPTCHA, an advance-fee scam pretext, and a visual download button, all designed to trick the user into clicking a malicious URL. The embedded URL points to a site offering 'free game hack' which is consistent with a phishing or scam attempt. No scripts were extracted, but the PDF structure itself facilitated the malicious lure.

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-online-free-game-hack
    • http://lib.uho.ac.id/library/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-mod-version-free-download_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/can-you-hack-roblox-accounts_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/free-robux-com-roblox_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-robux-websites-2021_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/free-domain-for-minecraft-server_GM479516143.pdf
    • http://lib.uho.ac.id/library/repository/free-roblox-intros_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-hack-for-android_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/game-hunters-coin-master_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-roblox-gift-card-codes_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/easy-free-spins-coin-master_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/roblox-hack-client_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-game-download-free_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-game-hack-link_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/free-spins-from-coin-master_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-coin-spin-daily-link-net_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off0003813c.bin
abaf6985eda00f17b82cc12c54a88a462de515fbfaf536323297aaba5b935002
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3813C 26180 bytes
font_01_sfnt_off0003bea2.bin
699920e89d53af3da9098a1b5085b2ca8ec1c411a1945f28ab7cc1e8ab9767a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x3BEA2 18484 bytes