Malicious PDF — malware analysis report

Static analysis result for SHA-256 b380b58d5a5f642a…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 10:56:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5eab84bb43c98144520192d101e9cadd SHA-1: c1a37a0ef3f7a79f63078c1df9e9f739d3846586 SHA-256: b380b58d5a5f642a44ec79c05c39a57b3c90f748fc3dec5b3672abd55fbfd673
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a "free generator / game hack" lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded links suggest it is designed as a phishing or scam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/406889139/daily-free-spins-coin-master-app-game-hack In PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-earn-robux_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
stream_004_off000051e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E4 27652 bytes
SHA-256: 6127c9372abb2617e9638ba95795de8660ef4cfc01acb2fdf89c44b48da517b9
font_01_sfnt_off0000915d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915D 18308 bytes
SHA-256: 72dba927d197b121f2f79f603316478a8fd74b1897291e20c9d2ace2afc386f7

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