Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ef9e10495c911d…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 13:00:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: edab15b20f9f879dbf26cb2db294f057 SHA-1: b7e90df1deee5c130d12f7ce80e21b272ff4420d SHA-256: e8ef9e10495c911d9a0338bc100b7bf2c74124cb38d20acddf30d0fad795ceea
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 free game hacks. The primary lure URL is http://netcdn.tw/app/406889139/free-hacks-for-coin-master-game-hack, which likely leads to a further exploit or malware download. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/free-hacks-for-coin-master-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-on-macbook-air_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/official-cheats-and-codes-for-roblox-robot-blocks_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-hair-on-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_off00002eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB2 22588 bytes
SHA-256: 6332c7f0b9d5d7fd0b0eb49aa6361d9021809d623fd4cf3a37bb10dd3dded31a
font_01_sfnt_off00006155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6155 18168 bytes
SHA-256: 1e436942c22cf5f1ddb993b5625de9063034e514cb54256dfb31bec93a9ee0e1

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