Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89c35b3f57670b5…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 14:41:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 906435cd79a29351abc7b195d4e57b76 SHA-1: 2bb7a608f132e78c071a074ce03bacf28c6fa9ab SHA-256: e89c35b3f57670b555af5c22912888b0f415d585d767e3bf560b31498de9d72b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a known malicious URL. The document body also contains this URL, reinforcing the 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.

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-spin-today-game-hack In PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/lag-switch-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/hackear-tarjeta-virtual-para-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/bux-life-robux-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/hack-ninja-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-robux-with-no-verification-2021_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_off00003059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3059 22624 bytes
SHA-256: b91be7ac854332ef2b1dbd8317b8a0a4a6b18052d5967e708334fc3cf9bae5a6
font_01_sfnt_off000062de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DE 18528 bytes
SHA-256: 611292c7b78d9aef83f236a5f61e8588922333099173db31565d3b831f2ee55a

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