Malicious PDF — malware analysis report

Static analysis result for SHA-256 b159b0cb25781af2…

MALICIOUS

PDF

34.6 KB Created: 2021-06-18 20:05:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8dee9e569018b275e466a48622ef243c SHA-1: c46344ddf5844ac0c0f5c65ddbd0dfb9761cea91 SHA-256: b159b0cb25781af2ba3b4a024957c2feef2f96c853647119e8444a4498cc26d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a malicious redirector, specifically advertising 'game hacks' and 'free generators' to lure victims. The primary URL identified is http://netcdn.co/app/431946152/how-to-hack-a-roblox-account-using-command-prompt-game-hack, which is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at driving traffic to potentially malicious 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.co/app/431946152/how-to-hack-a-roblox-account-using-command-prompt-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-cheat-for-brick-bronze_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-anything-on-roblox-catalog-for-free_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-diamons-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-roebucks_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
font_00_sfnt_off00002fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB2 21776 bytes
SHA-256: 3dbddc914b9f322694b4933de843560feb18ef4bbf1c5bff3a3ff5e323eb4df0
font_01_sfnt_off00005fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB7 19948 bytes
SHA-256: ed06714fa2c72063095fc3686c617735eb2fa6e0a830655cdd788c60de44e1ec

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