Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a945d50bfc3750…

MALICIOUS

PDF

34.7 KB Created: 2021-06-30 10:55:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 59f271a2721f5902eb446ded34cdf1df SHA-1: 83e80df4f3b393f9c56384214fcb88b0979c6561 SHA-256: b0a945d50bfc375078d142455c5e1fe7f33c4037cee5add4c16df374cf8e15ee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The document body and extracted URLs strongly suggest a lure for users seeking cheats or in-game currency, which is a common social engineering tactic. The ML classifier also flagged this PDF with high confidence.

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/lvl7-roblox-hack-game-hack In PDF document text
    • http://pustaka.pn-calang.go.id/repository/change-your-skin-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-donation_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/best-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/ww-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-permanently-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/download-free-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/cheat-engine-roblox-hack-client_GM431946152.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_off00002fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA3 22872 bytes
SHA-256: 20d29d66a33e3497e6dfb24dee0e57cf356e5ffc7dae19219b1765a7022bc858
font_01_sfnt_off000062ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EC 18828 bytes
SHA-256: f8f235fdacaa8520d96ec6c30ce226ad5891f3fe8e659b3aa2f23d7dadceddd6

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