Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f3dc379342c3ac…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 05:12:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0db75907453686ed23c10fdc0a2af267 SHA-1: f824f978a016c42a9e00290fd34470ee5c84946f SHA-256: c5f3dc379342c3acfc316bcadb31762dd7ffc7cc6a060b7e66732341fbfb2e4b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains lures for game hacks and generators, directing users to external URLs. The presence of embedded URLs and the 'PDF_GAME_HACK_REDIRECT_LURE' heuristic strongly suggest a social engineering tactic to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/free-roblox-scratch-game-hack PDF link annotation
    • http://apartmani-mestrovic-krk.hr/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/minecraft-hacks-list_GM479516143.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_off00005000.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5000 28756 bytes
SHA-256: a8afbeb388bcba323fe1ab00113e55c0db152a6c354a089b4034c3881d7d4d29
font_01_sfnt_off00009131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9131 18448 bytes
SHA-256: 2ff0c6656b0f8556b730bbe5e1a77ae9526c14b67f3764ca177457930419aff9

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