Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c8404d13e4fe04…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 16:01:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d5831508dad8249e2d9ef0a28bdbce81 SHA-1: f0bc1b415b326f9f1abe76b0ce1caa169e2a6d6b SHA-256: 28c8404d13e4fe046cd7505015a2cd48158e9c152f3bfa04f9503d73e203ff44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The primary link, http://netcdn.tw/app/431946152/robux-boost-game-hack, is identified as a malicious redirector. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites.

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/431946152/robux-boost-game-hack In PDF document text
    • http://nationshield.ae/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-big-brother-hacks_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-man-face-roblox_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/ninja-animation-package-roblox-free_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-gold-cards-hack_GM406889139.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_off00003005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3005 22808 bytes
SHA-256: 6ca269cc831c9f3a2ac109e0a486517430248c6d0655b3d0d1c706be466adb9d
font_01_sfnt_off00006317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 18656 bytes
SHA-256: 93d6d3b7fc8d10ece64158089a71637dd9295c84ea90a856dbff66fc552b925b

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