Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cb986a3a495e5a…

MALICIOUS

PDF

37.2 KB Created: 2021-05-10 13:59:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fd129a4d055ce416307ac78ef6e71b7c SHA-1: eeccd8570a3bd2e5826cd54ec4cc3dbe681630bb SHA-256: 43cb986a3a495e5ac0f13e4393097a6137be452e210daa59806e124db8f2bbd2
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for "free coins and free spins" for a game, directing users to a URL that is flagged as a game hack redirector. The document body also contains text and links related to game hacks and generators, and a fake CAPTCHA heuristic indicates an attempt to trick the user into interaction. The embedded URLs suggest a phishing or scam attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9388

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-coins-and-free-spins-coin-master-2021-game-hack PDF link annotation
    • http://michalmatys.pl/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://michalmatys.pl/images/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://michalmatys.pl/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://michalmatys.pl/images/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://michalmatys.pl/images/roblox-rape_GM431946152.pdfIn PDF document text
    • http://michalmatys.pl/images/get-free-robux-today_GM431946152.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_off00003722.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3722 24592 bytes
SHA-256: 5b8086cde71f1c10eef4d6817d56443d622f33e50d89d185caeee5b3c6ff38d5
font_01_sfnt_off00006f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F05 18460 bytes
SHA-256: 871f0cb0a27f8e5dd89901f10b004c29658dd5d4ba968b8e0fec3a5b4bbe6c5a

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