Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b21f243ada32ef…

MALICIOUS

PDF

41.4 KB Created: 2021-04-28 23:20:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bdfeea9132a98ed0d8bc824a8ef37366 SHA-1: c6782ed348baed11aa143c1acbb51744d68a2907 SHA-256: d1b21f243ada32ef7952486e5bacb054b34e8c44427023cc434caa83c69e6863
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'game hacks' and 'free generators' for popular games. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the lure of free in-game items suggest a phishing or scam attempt designed to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/how-to-hack-epic-minigames-wins-roblox-game-hack In PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/best-free-muskets-in-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-generator-2021-without-human-verification.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/is-roblox-free-to-play.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-hack-robux-no-human-verification-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/make-your-own-roblox-avatar-for-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-script-executor-for-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/noob-vs-pro-vs-hacker-roblox-pet-simulator.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-rs-on-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/robuxian-robux-hack-prison-klife.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/sysnaspe-crack-free-2021-roblox.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
stream_003_off00004103.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4103 26200 bytes
SHA-256: a4afc54a4b21a0316e706fd16b1209766181c635cd135c9dd1661014278e9f73
font_01_sfnt_off00007c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C24 19584 bytes
SHA-256: f33531af88e51afaa589c7eb032c2ab8dd6e980827eace61b9b7b6def6e462f1