Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baf7726b326dfc9…

MALICIOUS

PDF

36.3 KB Created: 2021-07-05 15:44:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6262d689d90a9a96a61b2d5549536ec1 SHA-1: 0ff940cde9d1d92d3ba351cec8ae3c2f638d0042 SHA-256: 4baf7726b326dfc9b5deae02e2c3ad4fe4f08d5551a884499469495d9ba2d720
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/406889139/coin-master-pc-hack-tool-game-hack, which is disguised as a game hack generator. The document body and embedded URLs reinforce this lure by mentioning game-related cheats and free items. The presence of embedded URLs and the nature of the lure suggest a phishing attempt, likely to deliver a secondary payload or lead the user to a credential harvesting site.

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-pc-hack-tool-game-hack In PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-a-gamepass-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-lumber-tycoon-2-hack-windows-7_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/girl-clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-stuff-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/files59-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/buy-robux-for-free-2021-april_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-free-robux-offers_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hack-roblox-hack-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/cheat-in-roblox-gold-venture_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_off00003842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3842 22904 bytes
SHA-256: 92f64099668b24f59c79444c883436b8cb7e436322afe4e1eae51742004d7f06
font_01_sfnt_off00006bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB9 18232 bytes
SHA-256: 48f3d595066ca77e1fd8bc0efef9b839c1fbeea83629d4342e6ba8c1e8d978f9

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