Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fddc9dd63760f9…

MALICIOUS

PDF

32.9 KB Created: 2021-07-05 16:06:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 01bb02853bec7a5e6063def198b76158 SHA-1: 6aaa47e78fb696a03ee32cf342a44848222c1216 SHA-256: 66fddc9dd63760f9bc332fc602b128a60adb66d4fcc8c9be5920bf824de99824
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Robux, directing users to a malicious redirector URL. The ML classifier also flagged this PDF as malicious. The embedded URLs and document body content strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/how-to-get-free-robux-without-human-verification-game-hack In PDF document text
    • https://domc.tw/upload/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/which-tiktok-free-movies_GM835599320.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-cheats-for-robux-for-phone_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-hack-roblox-with-cheat-engine-67_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-hack-2021-for-all-games_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://domc.tw/upload/files/ulgames-resources-roblox-hack_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/pokemon-go-free-85_GM1094591345.pdfIn PDF document text
    • https://domc.tw/upload/files/hacks-for-the-mad-games-roblox_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-controversy_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-hack-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A00 21612 bytes
SHA-256: 9f753801b749f0136d92cacd33b3193696f8232b785f692b96f375de9c9714c8
font_01_sfnt_off00005961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5961 19860 bytes
SHA-256: 495fe8ab67ccc92980b130970b14ca59a4055a895de5252c8ccba287623abf67

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