Malicious PDF — malware analysis report

Static analysis result for SHA-256 91eab7a31c71a005…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 19:17:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 74d343935211e20206dfe967578a0cad SHA-1: 282c82a46cb1fc7a577add498d24414019702571 SHA-256: 91eab7a31c71a005988f60a8cf50a54bd0d084cc5eb5e59ae624877ceaa06fcb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and currency. The document body and embedded URLs strongly suggest a lure for users to click through to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/431946152/robuxy-com-free-robux-game-hack In PDF document text
    • http://pustaka1.unindra.id/repository/roblox-dragon-ball-mastered-script-hack_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/hack-roblox-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/hacker-group-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-download-apk_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-robux-money-hack_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-from_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_off00002d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D65 22276 bytes
SHA-256: 2e1c6efdbe7ef454a3195ac337293cb257a09e846f5f698605a370f1028837ad
font_01_sfnt_off00005f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0B 19156 bytes
SHA-256: b91dd01bf7aa8d90f2367b3a0684131ce65c63b3af9073ea9819d735ead4d135

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