Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcf115cdbd7a8fa…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 05:33:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bf21823b47bb1a2b69be85dde49262cd SHA-1: c44e1f5cb81e9941527cdc36ef5874b15bb5d1f1 SHA-256: efcf115cdbd7a8fa0a74e306e718a866ff5bf83df811a4c2142a9b3e68915757
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a malicious redirector, disguised as a game hack generator. The primary link, https://netcdn.online/app/406889139/coin-master-free-foxy-food-game-hack, is designed to entice users to click through to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering lure for 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.online/app/406889139/coin-master-free-foxy-food-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-ban_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free_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_off000050d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D2 25196 bytes
SHA-256: 92c3eb3161d9010ba42d4e88da9fe4dcf07bdca9455bc063ef04ad2721365360
font_01_sfnt_off00008b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B32 18272 bytes
SHA-256: 8ab577f7d11ec357d53ae04dd403853c84d9c5a16931abfa6eafc1dca89914d9

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