Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf45e853c9fcd56…

MALICIOUS

PDF

46.9 KB Created: 2021-06-09 10:23:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 568687cd7e886d588700898b1a786a96 SHA-1: e49e3c938f732088f8937d2a40fc6c030350e068 SHA-256: daf45e853c9fcd567fb9774841a688ecc45452139ff4cc67ae23541f9ff882e0
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirectors and known malicious infrastructure, disguised as 'free generators' or 'game hacks' for popular games. It also displays a fake CAPTCHA, a common social engineering tactic to coerce users into interacting with malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver a second-stage payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • 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
  • 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 https://netcdn.tw/app/431946152/using-cheat-engine-in-roblox-game-hack In PDF document text
    • http://axiapublishers.com/images/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://axiapublishers.com/images/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://axiapublishers.com/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/roblox-game-studio-unblocked-cheats-download-guide-unofficial_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/get-the-free-robux_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/how-to-login-to-cerberus-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/free-robux-live_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://axiapublishers.com/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://axiapublishers.com/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCC 24564 bytes
SHA-256: 2f4f84582fa0a7966f1deaba6a7f6dd9d3417de5d5c08e6f77258c62790cb108
font_01_sfnt_off00008884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8884 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00009294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9294 18876 bytes
SHA-256: 6416a0bceaa3a36c3dcfdb303e9c19d33d42d6fb975a1cc3063116f5dab804ff

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