Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c7aa6abd5a7bf4…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 01:56:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 794b5ce93f0091a9adc1bfa59e6d360c SHA-1: c645190b67519ef16307ea2890d726de452e4a93 SHA-256: 64c7aa6abd5a7bf4422f88b187e8e97f11fd725731b68ffcdb19c7eebc25a429
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The primary URL, http://netcdn.tw/app/406889139/coin-master-free-spins-link-without-human-verification-game-hack, is repeatedly referenced and appears to be the main lure. The document body and heuristics confirm the intent to redirect users to potentially harmful content, likely for phishing or malware distribution.

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-link-without-human-verification-game-hack In PDF document text
    • http://library.atim.ac.id/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/is-it-okay-to-use-free-models-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-free-pets-in-pet-simulator_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hacker-roblox-server_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-games-that-actually-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/instant-robux-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-10-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/jailbreak-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-fly-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-roblox-synapsex-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-for-free-hacks_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-write-a-script-for-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/comment-hacker-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/lina-roblox-me-hackean-la-cuenta_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-shark-hack_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_off000030e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E5 22868 bytes
SHA-256: 5281918fc78235d352222c23460189bace33ed31df1db5934e25024be84662ed
font_01_sfnt_off00006439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 19244 bytes
SHA-256: 0c63abbe58859d209b3df0ea6da396dfaf3a882fadb5113124574a7e4c6c3b56