Malicious PDF — malware analysis report

Static analysis result for SHA-256 361195a3b6fdd95f…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 13:25:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6f245fc9970d0efee8cb597ad278e412 SHA-1: 82823c6709d2d381f1d5b6f938a7ca7d5ef40510 SHA-256: 361195a3b6fdd95f968fc1757b63f90347761b055918ff716546c33ff51c80d3
220 Risk Score

Malware Insights

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

This PDF document contains numerous links to websites that appear to be part of a scam, offering 'free generators' or 'hacks' for popular games. The primary link, http://netcdn.tw/app/431946152/easy-robux-com-game-hack, is flagged as a malicious redirector. The document's structure and content strongly suggest an attempt to lure users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/easy-robux-com-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-hack-roblox-accounts-with-bruteforce_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-free-item-generator_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/grifffin-hat-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/prison-break-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/robux-freebies-hack_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/robux-hack-tool-no-download_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-hack-the-roblox-developer-console_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-how-to-get-free-accses-to-welcome-to-bloxburg_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-online-game_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
font_00_sfnt_off00003078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3078 22840 bytes
SHA-256: d09f1b06bac24832ffd8770f8ec812bbc7adb950c58730fdc303b0c5f409fc7d
font_01_sfnt_off000063be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 18992 bytes
SHA-256: e172f2d78f69c4c8101f4573d47d63447388608efe44122c1ac8672dc65a13b2

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