Malicious PDF — malware analysis report

Static analysis result for SHA-256 67837f243c38c3f5…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 13:21:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7c8fb1e100ba36ffdde9ee16444ea27b SHA-1: fec2be36b54f26ed623923b0c27733714edf3d7b SHA-256: 67837f243c38c3f5badda2c69eab6a89201598dc3ffc78c1ff248ee1c4e71451
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body also contains this URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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.tw/app/406889139/coin-master-free-spins-hack-ios-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/free-btools-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-robux-100-real_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/auto-clicker-for-mac-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/haktuts-coin-master-free-spin-link-today_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
font_00_sfnt_off000030d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D6 22400 bytes
SHA-256: 9b03c163dc9d77e6f12edb4eac9d1e01a79788dadb548190263678e7f28c7a4c
font_01_sfnt_off000062cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CC 18344 bytes
SHA-256: 9ca4fc3a56624e697d55a445555b4a4bd6af10b50a4033a9f1409e58d37d90f1

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