Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f73130542577b60…

MALICIOUS

PDF

46.9 KB Created: 2021-05-14 10:31:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ad9bb69ec511d8d640b7b512db06ca38 SHA-1: 802be8116b3de1d8648dd2e6afd30580840fdf94 SHA-256: 7f73130542577b6062816464d86b0e2458d821568c943814a3d0ce023f755929
160 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious redirector links, specifically targeting users with a lure for 'Coin Master Hack'. The document body, though heavily obfuscated, contains references to the same malicious URL. The presence of embedded URLs and a visual download button further supports the social engineering aspect of this attack. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/406889139/coin-master-hack-here-game-hack In PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/robux-online_GM431946152.pdfIn PDF document text
    • https://www.hearcolors.com.mx/img/blog/files/coin-drop-master-free_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
stream_003_off00004a12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A12 30432 bytes
SHA-256: 8a1a32568d73b967dd6f4d22a2b0304828f1ce62617cbe478d99c4df301442ad
font_01_sfnt_off00008cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBE 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00009660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9660 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed