Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d24621fe015d2e5…

MALICIOUS

PDF

44.0 KB Created: 2021-06-09 07:02:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 05e920cad9036f200799010a6c53c1ed SHA-1: 44fd79814ab4c5364ab4c399929b85f89384f50a SHA-256: 5d24621fe015d2e5a9180c2603e078d99159aff254d758f97ccc6aa126ed0690
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to known malicious redirectors, specifically advertising 'free generators / game hacks' for popular games. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-scripts-prison-life-hacks-pastebin-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a lure designed to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-scripts-prison-life-hacks-pastebin-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-robux-hack-computer_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/master-game_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-hack-character-skin_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-coin-master-spins-daily_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
stream_004_off00005072.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5072 24088 bytes
SHA-256: a8641dece1cff8604d712794e5379fea14b9bba3af6ef3e026d2e1b454286c1f
font_01_sfnt_off000087ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87CA 18736 bytes
SHA-256: 0abf6ef4d7ea46e7785f259ef66bb2e68c86a637ea9e88d926e7558caeefb21b

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