Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f38111bda50afa…

MALICIOUS

PDF

251.1 KB Created: 2021-07-05 10:41:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 657b27a202ec641acd2b6edf4caaaf1a SHA-1: c05f0d05ff020c4e358d9537c3c9c3d689aef291 SHA-256: 61f38111bda50afaa2641db69a0180e24e0a3e6e15439bb663d2d49a656922ca
180 Risk Score

Malware Insights

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

The PDF document uses a 'game hack' lure to trick users into clicking a malicious URL. It also presents a fake CAPTCHA and MFA harvesting prompt, indicating a phishing or credential theft attempt. The embedded URL, http://netcdn.tw/app/1330123889/pubg-uc-whatsapp-group-link-game-hack, is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-whatsapp-group-link-game-hack PDF link annotation
    • http://library.persadabunda.ac.id/repository/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coun-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-admin-commands-hacks_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hack-aimbot-roblox-gartis_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/bananaman2021-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off00037cfc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37CFC 26044 bytes
SHA-256: de18d25e63f40a4382229bac3ab1216d01ad37f9ad12e08d9e7c7a2f1f85196a
font_01_sfnt_off0003ba70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA70 19204 bytes
SHA-256: d0883f260e26c56c780d4a53f662da1d3bdf1905b4d1cae22e2d2b9ac13351a2

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