Malicious PDF — malware analysis report

Static analysis result for SHA-256 a876ad201bdd4eef…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 07:32:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f2bca940a97463834d41f5b00dd80964 SHA-1: ad0b34fcd2ff42b3308837d760911c7b55f61ac9 SHA-256: a876ad201bdd4eeffe152ea9c549145d66ac22de8bb8a79fe6996e9749675065
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks and free coins, directing users to a known malicious redirector. The embedded URL http://netcdn.tw/app/406889139/coin-master-free-coins-link-facebook-game-hack is a primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

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/406889139/coin-master-free-coins-link-facebook-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/alert-before-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/tous-les-script-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-asset-download-for-t-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/llogin-to-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-shoulder-pets_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-in-inspect_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/como-hackear-roblox-para-tener-robux-infinitos_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-daily-spins-coin-master-2021_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_off000032d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D8 22780 bytes
SHA-256: 8f7b76a4dc4a937d7d280c589630dda7190bac15debdfe8e4928c1b066321ebf
font_01_sfnt_off000065d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D4 18324 bytes
SHA-256: a658124a96d7796e28a28fa88504f15f0c1b8d02bb82398f146ea7e801da5874

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