Malicious PDF — malware analysis report

Static analysis result for SHA-256 16031ea9021e5e9f…

MALICIOUS

PDF

44.2 KB Created: 2021-05-12 08:02:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 663f9e22ac3d1fdff2917ed44a49e472 SHA-1: 718253e61b63893a18be5a9af2e4668880ee7929 SHA-256: 16031ea9021e5e9f87473a0fdd56b593055f667f97500e0f42ffaac4a68ad079
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free Robux and game hacks. The primary malicious URL identified is https://netcdn.xyz/app/431946152/websites-to-get-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive traffic to potentially harmful sites, likely as part of a phishing or scam campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.xyz/app/431946152/websites-to-get-free-robux-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/bux-life-free-robux_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
stream_003_off00004923.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4923 28232 bytes
SHA-256: 6ed7cfbd84a57e88fbb314d35d50bd9546b899e85f3f86ce3c809982e68643e0
font_01_sfnt_off000089e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E2 18436 bytes
SHA-256: 6ab9ab31980840835fbaeca164a74f0e8188db39a6ce5c5e4face3e95ba0b523

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