Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83c5c8f7ff81fa1…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 13:32:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: af89338fcc8b217adcdee54abd08dabc SHA-1: d377dcc10f3efde366055af1d7e5429e8b6f475a SHA-256: e83c5c8f7ff81fa188edaa953cb2196719b24c729ecf1a6a68cf41cb7fe2efad
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to what appears to be a malicious redirector, disguised as a 'free generator' or 'game hack'. The document body, though partially corrupted, contains references to 'Coin Master Twitter Free Spins' and a URL that aligns with the heuristic findings. The presence of a malicious redirector and the lure of secrets (like private keys or passwords) indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.online/app/406889139/coin-master-twitter-free-spins-game-hack In PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-website_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/pubg-30-uc-buy_GM1330123889.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/robux-gratis_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/earn-robux-online-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-coin-master-spin-app_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
stream_004_off00004e89.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E89 25032 bytes
SHA-256: c9ffe8e0bdd5aacd80b85f81956d6f9316ece0b3d1ece27f9a80d5e5babf18be
font_01_sfnt_off00008825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8825 18052 bytes
SHA-256: d5c713e21d1796f9829cfc955fe60add37e43b6f073cef82b9d1bf41a9ab85b5

Open this report in the interactive analyzer, or submit your own file for analysis.