Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa508e792fc0c9d…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 19:20:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f5bb94c25b207c2246166a08315e113 SHA-1: 8e3dd5416f890ce4235f7939baec0a5abf29d19c SHA-256: 4aa508e792fc0c9d435f28d84e3b29333c4998b0543253e0db3b82b943a41392
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a primary redirector pointing to a "free Robux generator" lure. This indicates a social engineering tactic to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.tw/app/431946152/free-robux-generator-for-roblox-2021-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-free-robux-hack-online_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/app-to-earn-free-robux-for-downloadign-games_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/www-free-roblox-games-com_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-2021-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/boxing-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/tiny-tanks-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/forstakenfree-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hack-adopt-me-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-roblox-knife-simulator_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-ios-hack-tool_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-hacks-online-generator_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_off0000311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x311B 22712 bytes
SHA-256: 0e13f96b66304365699820740bafee549c4b658e40e8aea24dc5bc7f8cc62452
font_01_sfnt_off00006414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6414 19296 bytes
SHA-256: 1c5b5ef18537994d2b9d4bcfadda653dfd61b801510ea22c778e1317dc9212ff

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