Malicious PDF — malware analysis report

Static analysis result for SHA-256 335c11d03d8b462e…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 09:50:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 98efa91c9d1c9e3baa7ba00050e32b20 SHA-1: 097d617b425e00f90646f53e563d98a6ca7babdb SHA-256: 335c11d03d8b462e85e5c2ba80711a876d43c7c3f056f70c1bfeeef2fed8bc1e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'game hacks'. The primary malicious URL identified is https://netcdn.online/app/406889139/free-spin-coin-master-link-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering lure designed to redirect users to potentially harmful content or further malicious downloads.

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/free-spin-coin-master-link-2021-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/will-tiktok-free-download_GM835599320.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/where-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-hack-iphone_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_off000050cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CC 24140 bytes
SHA-256: 6e0e5a71d3addf3ddde849995ba3e87a80ca901ec5ce7d67123cd0eddcfdf93a
font_01_sfnt_off000087c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C5 18456 bytes
SHA-256: e9900cc34792e9e10189734f2c0a95be85fa7d2c8d6cb23872c5da80ce816735

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