Malicious PDF — malware analysis report

Static analysis result for SHA-256 e613e0d706eac560…

MALICIOUS

PDF

50.0 KB Created: 2021-05-12 08:32:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9c4fcc20fa3f01e2c910864263ef8e5a SHA-1: 5216930b16076e7dd6e8b98fd7280ea10382516d SHA-256: e613e0d706eac5609771bfc8150b7973bde1d06d322c99c18cffb0fb17428bc5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering game hacks and free currency, presented with a fake CAPTCHA to trick users into interaction. The primary malicious link identified is https://netcdn.xyz/app/431946152/www-free-robux-game-hack, which is flagged as a known malicious redirector. While no scripts were explicitly extracted, the document's structure and embedded links suggest an attempt to redirect users to potentially malicious content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/www-free-robux-game-hack In PDF document text
    • http://library.umla.ac.id//repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BAD 25576 bytes
SHA-256: ebf489757dfa39b93fc4ff03a2e8dfaf1b5d07700202ce146465c5f67f5522dd
font_01_sfnt_off000085b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B1 8252 bytes
SHA-256: 7ebedd6b182173c8e55836cb0d114b2c4a0ac85c96a51b9f0706c935f8415fea
font_02_sfnt_off0000a0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C6 18376 bytes
SHA-256: 3afa3067d1f3c9d8d4e5028784d7d2a7352a3b977a914758f486701e4d265e0a

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