Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3b882b1e62ade7…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 08:46:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7606bfc71fb64492a4cd8a96e2ad8b1 SHA-1: dbc12de382e61e9ccc148bbfdb5d59b054b47b05 SHA-256: cf3b882b1e62ade70afd5fd12d6eb472b8a7ac919bed328cae83c66d15799718
160 Risk Score

Malware Insights

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

The PDF document contains links that redirect to a malicious site, masquerading as a game hack generator. This lure is intended to trick users into downloading potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a download button heuristic further support this assessment.

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/mcpe-master-hack-unlimited-coins-download-game-hack In PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/s303-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/game-toolbox_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-stuff-that-cost-robux-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-hair-roblox-promo-codes_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_off000031e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E4 22716 bytes
SHA-256: 85f61ff87f6a900ef732a7f35147f8f9b0ab152f2ffb41267df5761857e093df
font_01_sfnt_off000064ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BA 19208 bytes
SHA-256: 55bd449ca9c9a3662e942640cef298b304cdbd1e08c88d4e10aed8779b927ced

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