Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c5ece63bd88357…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 21:36:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4944eca58a019d26111b8e918422b9b5 SHA-1: 45f90cf23f525052fd15a79e0cd3b2a3e6fcb977 SHA-256: 50c5ece63bd88357fd44f5ce106aa5f74ecfb2360ca98100351a59722a3ea83c
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators for platforms like Roblox and Coin Master. The heuristic firings indicate that these links are known malicious redirectors, and the ML classifier strongly flags the document as malicious. The primary attack pattern involves luring users to click these links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/431946152/roblox-avatar-com-game-hack In PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-pants-roblox-wiki_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-redeem-cards-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-bubble-gum-simulator-cheat-version_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-speed-in-dash-simulator-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-easy-cheat_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-free-download-linux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hack-adopt-me-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/comment-hacker-sur-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-make-robux-fast-and-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-buy-anything-from-roblox-c-atalog-for-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-com-no-verification_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
font_00_sfnt_off000032e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E3 22200 bytes
SHA-256: 3ecdadbe8a6ce4284334cf16265cdab0c945d4c41736f0f16850343266e680f1
font_01_sfnt_off00006433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6433 18964 bytes
SHA-256: 6c73279a6f200e59a6bfd18b793709ba0d2b202440332040bd73c13792b6dc5b

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