Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5273ce44c9b8483…

MALICIOUS

PDF

28.5 KB Created: 2021-05-15 13:55:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4b3dd20418aad61eed145d6f23f97da6 SHA-1: f5d0abdbe3ccf3489618e722827a4c2f0f4b3238 SHA-256: e5273ce44c9b84839cad9963c33c233330b4cb2d2a24ad8185f8d085718d3afc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links to a known malicious redirector infrastructure, specifically promoting 'game hacks' and 'free spins' to lure users. The redirector then points to other malicious PDFs hosted on a different domain. This indicates a phishing or scam campaign designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 3

  • 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.
  • 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-free-spins-link-today-new-game-hack In PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/minecraft-free_GM479516143.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/coin-spin_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/best-hacked-client_GM479516143.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://vinhoshortencia.com.br/media/ckfinder/userfiles/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004eea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EEA 12558 bytes
SHA-256: a99373258e280fb3bf7a26eee9318947908fa7a0e777c6654cdcaa9d176d3f0e