Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed31ea1f36ce52a…

MALICIOUS

PDF

33.7 KB Created: 2021-06-28 11:07:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 757d7e2839485f2ec62be848fb61b3eb SHA-1: 07d0e77b5104a02d11730fbf4b9c19fc4b5a50e0 SHA-256: 2ed31ea1f36ce52a755f9a590daae21435b8e3fcfe9ac60fbadc3c2742a6483f
180 Risk Score

Malware Insights

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

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirector URL, which likely serves as a gateway to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-roblox-invitations-loadstrings-full-lua-free-no-virus-game-hack In PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-2021-on-a-chromebook_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-hacks-on-midieval-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/como-hackear-cualqiuer-juego-de-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-pets-paradise-hack-script_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-mobile-hack-apk_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-and-limiteds_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-hack-stats_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-unpacking-simulator-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-how-to-get-any-item-for-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/boxing-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-free-boy-face_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/blocks-of-war-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-easy-robux-today_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-speed-hack-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-yellow-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-make-your-own-hack-for-roblox_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_off00002bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BAD 22472 bytes
SHA-256: 29644f57376e3caad494fdbf459016335307b4b939545238a7d2847dae8447d6
font_01_sfnt_off00005de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE3 19436 bytes
SHA-256: d529164255c98d748e0972a811c4567d0ee04c0479052642c89acfabbf5f7bfe

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