Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d7e52196e8dc8f…

MALICIOUS

PDF

33.1 KB Created: 2021-06-19 15:00:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b1ed30f89700c574a20749da11a7680 SHA-1: 56559a8489ffad0836b959f8f9da9f127ac1ab0b SHA-256: f8d7e52196e8dc8fde66bff9e6e018fc952824d2ef6392c7b909d7488f82a95c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The primary lure URL is http://netcdn.co/app/431946152/how-to-get-free-robux-a-simple-way-game-hack, which likely leads to further malicious content or downloads. The document body and embedded URLs reinforce this lure, indicating a social engineering tactic to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/how-to-get-free-robux-a-simple-way-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-games-fan-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-in-roblox-pc-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-tokyo-ghoul-online-cheat_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/chrome-store-extension-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/pubg-uc-and-bc_GM1330123889.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spin-link-daily_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_off00002a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A57 21692 bytes
SHA-256: 39d60f96a40a02e8e9fe1a29c1cb5b8eeaff9f5e0e649c6e314ab6c5f4721369
font_01_sfnt_off000059e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59E7 19992 bytes
SHA-256: b0064063c087ebf7d4026a23b67ea06544b3f56a1022a0519f84b087af1e530f

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