Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d90d5030a85e9e2…

MALICIOUS

PDF

48.3 KB Created: 2021-05-12 23:36:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d9b37c88e7357a27351b20959518378e SHA-1: 38cffec572757d64a886c900a6c15ee5eb77cedb SHA-256: 3d90d5030a85e9e260b0285157511646047b47d9a04a84fe4c092c95144d247d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them by promising free game currency or hacks. These links redirect to known malicious infrastructure, specifically a URL associated with free Robux generators. The presence of embedded links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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 https://netcdn.xyz/app/431946152/free-robux-codes-generator-no-verification-game-hack In PDF document text
    • https://globair.com.tw/image/data/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-coin-master-s_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/mistplay-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/roblox-download_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/abd-roblox_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • https://www.bandicam.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D3D 26700 bytes
SHA-256: 01ec246ebd67f362b871cdcc771ebf66dd9e9249f7db1da07a58d093c6dd462f
font_01_sfnt_off00008bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF5 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9906 18776 bytes
SHA-256: a4a7f46a8ec4e4fe0089faa119d4be48f59112184e2c655defb35f5102acccee

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