Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ffb3c07af13357…

MALICIOUS

PDF

45.3 KB Created: 2021-06-03 14:14:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2f7c596598ee117d3271348464d85901 SHA-1: 81467a32b274191acf53063a7885624a1de99048 SHA-256: d6ffb3c07af13357476cfbdfee4c47b2dc547d7d83e4fec175d70c42972aa8a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as game hacks or generators. The primary malicious URL identified is https://netcdn.online/app/479516143/minecraft-free-download-apk-softonic-game-hack. The presence of these links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/479516143/minecraft-free-download-apk-softonic-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-girl_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-2021-nofake_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-coins-for-coin-master_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_off0000527f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527F 25520 bytes
SHA-256: 0b8ea5db996f685b785348fe88b9622eddec10825c749c124f82d1594af282f8
font_01_sfnt_off00008d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D81 18636 bytes
SHA-256: 8d59af17281decbf927120d542a9fc6958c86d48fe17fe9ad1336eeca3d2c8a1