Malicious PDF — malware analysis report

Static analysis result for SHA-256 385a1b2ea90418e6…

MALICIOUS

PDF

48.0 KB Created: 2021-06-10 22:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: af5d3766ced92db320e6de4810f4cf4c SHA-1: da3369e62449a69afda1a0e77b2a2ce600b0810b SHA-256: 385a1b2ea90418e6262eb4e6c919d1b6f01e06cd64848fa2282d83b0ef95dce9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and game-related lures, indicating a phishing or scam attempt. The primary link, 'https://netcdn.tw/app/431946152/roblox-hack-de-robux-game-hack', is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive users to malicious websites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-hack-de-robux-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-free-maps-download_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-and-slash-point-and-click-games-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn 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_004_off000051d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D9 25064 bytes
SHA-256: 03fe7bff6c11dd5b0991b3cfe8ff7d8e63c8d40e308dcc9f5ff3d721a69690f0
font_01_sfnt_off00008b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9E 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9845 18492 bytes
SHA-256: 374af60035e73dc4d983d77d00acaf47f32b199fb59bc432139b06ea2f5a6ca4

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