Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cad76b1507f4de6…

MALICIOUS

PDF

45.3 KB Created: 2021-06-07 12:09:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 817a1eaa65384d3e50e23cbe3782f299 SHA-1: 5bde806b479488f16634af46e6cf6dc40f35eb72 SHA-256: 5cad76b1507f4de6adbd9fe6f3ff784a514ad9263cc10eca9c348ea07c7d332f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The primary lure appears to be a Roblox hack, directing users to `https://netcdn.tw/app/431946152/roblox-online-play-free-game-hack`. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to entice users to click through to potentially harmful content. The document's content and embedded URLs strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-online-play-free-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-pet-roblox-grow-a-candy-cane_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-download_GM406889139.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_off00004f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F86 27412 bytes
SHA-256: 9c841fe767cd0423739f3026cee3dd0f4eca4c11668dcb30f8145a255421431c
font_01_sfnt_off00008dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBC 18628 bytes
SHA-256: dedc558d1330c2ab5b0fddfa5b9f731492695db92ec2b4fee38106d601253896

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