Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3978ef69f436c8…

MALICIOUS

PDF

32.5 KB Created: 2021-07-05 01:00:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6a6bf3d8c72e735dab4f0ae0393800a9 SHA-1: 3c31b79e0baad4fbc906b34954b6384c4cdc476e SHA-256: da3978ef69f436c85ddee14fe31ce9ed83378a772c97f603458b83e75c82d228
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and body text promoting 'free Robux' and 'game hacks', which is a common lure for phishing and scamming operations. The primary link directs to a known malicious redirector infrastructure, indicating a high likelihood of leading users to malicious content or further exploitation. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-robux-youtube-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-use-free-models-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-robux-hack-no-survey_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-roblox-menus_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-r-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-and-limiteds-hack_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/100-working-free-roblox-coin-gen_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/gg-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-pe-mod-menu_GM479516143.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_off000029ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29EC 21984 bytes
SHA-256: 97c4d492831f0ed3919762886f63f615e0990ace7223ed5563d0ef964ab3e378
font_01_sfnt_off00005a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A79 18984 bytes
SHA-256: 8bebb17fd92d279e9d491e2d23a61c4ead6df9403511c12439d4cdab80b3a674

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