Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b9947086ef2987…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 09:39:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 505c87ea5babb3ae3aa114471fb01430 SHA-1: e26b99478c503feb80eb51ca2b59a9d88296149a SHA-256: d9b9947086ef2987bc825d237d436613d0a375d281a8c182d94f41f1e212a70b
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and sites offering "free generators" or "hacks" for popular games and platforms. These lures are designed to trick users into clicking, likely leading to further malicious downloads or phishing attempts. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow.

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/835599320/tiktok-free-views-game-hack In PDF document text
    • http://library.acehresearch.org/repository/exploit-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/gamepasses-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/autospin-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/infant-roblox-free-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-doge-hat-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/mode-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-no2-copy_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-canada_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_off00003043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3043 22448 bytes
SHA-256: 58d18e364b60ff027caf2cec1ab54427cf7bba0c2d6e19f6a7d08cd5762882c9
font_01_sfnt_off0000627e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627E 18268 bytes
SHA-256: d820f3f51e2ba3ef6a73a64827aca4f18aa52e36628576c877f3f1fb2ca3df3d

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