Malicious PDF — malware analysis report

Static analysis result for SHA-256 14883e6f4ae5016c…

MALICIOUS

PDF

250.8 KB Created: 2021-07-06 14:04:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4b73c6f9f557e4b2d0d62b2b989e2892 SHA-1: 35cc8eb17c51d1212eb1a97a1003b10ec6257b16 SHA-256: 14883e6f4ae5016c9b8bd2b24d63aaceb61ebee3a91c01ca91c5cda3b328f74f
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a redirector hosted at 'netcdn.tw', masquerading as a game hack generator. It also presents a fake CAPTCHA and urgency lures to trick the user into clicking the malicious link. The document's structure and embedded links suggest an attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/pubg-uc-or-codashop-game-hack.
  • 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
  • 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-or-codashop-game-hack In PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-hack-windows-7_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/pokemon-go-free-roam-hack_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/tiktok-free-video-download_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-dinosaur-simulator-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-anti-cheat-update_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-the-scary-elevator-red-keys-locations-cheat-sheet_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-things-on-roblox_GM431946152.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_off00037d17.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37D17 26180 bytes
SHA-256: 9842ae138d45cff22cb63994eb40cc6727c2fd8b48163f1975a27eb580747030
font_01_sfnt_off0003ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA82 18784 bytes
SHA-256: 8f918ec8b30367a652453e5b9fb21d10b202157b124d27cdc5cfad7788ccc429

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