Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7a5d6f9c59312a…

MALICIOUS

PDF

33.9 KB Created: 2021-07-22 12:11:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2679d5701db9e0db4043e49f55af5e22 SHA-1: 7a4d8221b1e1c90827a5003949fa5970a519c653 SHA-256: 8c7a5d6f9c59312a29480ec3949daebd28abde21c39228b2222fc880c9db16e9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-with-no-verification-game-hack. The document body and heuristics indicate a lure for 'free Robux' or game hacks, suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the lure point towards an attempt to redirect users to potentially malicious websites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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/free-robux-with-no-verification-game-hack In PDF document text
    • http://www.akvamaster.com.ua/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.akvamaster.com.ua/images/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.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_off00002c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C47 22996 bytes
SHA-256: e6671fef68d16093901fe8410b04e9bfa4754b6a4f411cc4fb9fc87672c8917a
font_01_sfnt_off00006021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6021 19152 bytes
SHA-256: 652b0029b23c7cda534cf000d4417b368fc4549c03aa9c1baf0ba248c6510e17