Malicious PDF — malware analysis report

Static analysis result for SHA-256 71daaaec76064f18…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 07:48:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 307cfc59e8e6346e4ff304379815b4d8 SHA-1: f64a049773abb74d5c19d41bdd3131c34bf45451 SHA-256: 71daaaec76064f1827e14816f41a44cb43d6b026ecf01e9669c4a12a5e0d3cef
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document contains a lure related to game hacks and displays a fake CAPTCHA to trick the user into clicking a link. This link, 'https://netcdn.online/app/431946152/how-much-robux-can-you-get-with-1-million-dollars-game-hack', leads to a known malicious redirector. The document's structure and embedded URLs suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/how-much-robux-can-you-get-with-1-million-dollars-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/rbx-hut_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-cheat-robux_GM431946152.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_004_off000050ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CE 25216 bytes
SHA-256: 834c038574673767fa1a351650bf073c23177b1927a8b825e88c8eaec830c627
font_01_sfnt_off00008aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFF 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off000094ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94AC 19536 bytes
SHA-256: 876d9410c613bd28eae874a8e258613decc08a63963b9dc9af550a443a712a6c

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