Malicious PDF — malware analysis report

Static analysis result for SHA-256 33042bcbe70bce36…

MALICIOUS

PDF

36.9 KB Created: 2021-06-28 05:53:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f1ff9a3fe680b01eab8e42d6f1462154 SHA-1: ea2f276738382e3ee0f1d1cfc43a13a37b4906a0 SHA-256: 33042bcbe70bce36e9ea7cabcfcc3588fa84897b3a6d6a165dfa4a21945567bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users to a malicious redirector infrastructure, specifically advertising 'free Robux' and game hacks. The primary link, http://netcdn.co/app/431946152/free-robux-for-kids-no-human-verification-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a secondary payload or phish for credentials, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-for-kids-no-human-verification-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-computer-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-clibait_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/forum-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-arcane-adventures-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/change-your-birthday-to-this-date-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/gucci-logo-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-t-shirt-model-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/daily-free-spins-coin-master-2021_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
font_00_sfnt_off000037e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37E6 22508 bytes
SHA-256: eb6dc90431a049c6a8995d66bc235fee3f5589a4411a6e7a47162ebba6a93496
font_01_sfnt_off00006a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A07 19508 bytes
SHA-256: a4d06004451651b9c1fe70329c45c4b3ed3eb415d2f5474df56ab8a4a142f6a7

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