Malicious PDF — malware analysis report

Static analysis result for SHA-256 893de1e51a09066e…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 16:47:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f16ddb89a42cc5e8c4c78a2b0a620423 SHA-1: f9f83a994130f38e70aaea9c82994e7c21a67860 SHA-256: 893de1e51a09066efaddf970a8809f9e47bf97256e000262554a89ba57f9085e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a redirector lure, specifically mentioning a 'free generator / game hack' and linking to a known malicious URL. The document body reinforces this by displaying the same URL and text related to game hacks. This indicates a phishing attempt designed to trick users into visiting malicious sites, likely for further malware delivery or credential harvesting.

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-hack-apk-download-for-android-game-hack In PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-instantly_GM431946152.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-kakashi-outfit-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/is-minecraft-earth-free_GM479516143.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/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/basic-roblox-lua-programming-pdf-free_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-avatar-games-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/can-i-change-back-to-old-roblox-name-for-free_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_off00003342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3342 22624 bytes
SHA-256: 23c201d657f3f19b504a4495e740d8f00db02bc98e3e47f1290d85e60a1018fd
font_01_sfnt_off000065ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CE 18924 bytes
SHA-256: 1cf9981fa265b31f69f9f07c7993afa1bce844b0d5c7655559eae79f3315a78a

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