Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f86e43df0aaa33a…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 12:58:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4534583fa5942a51abb45ea5737a0460 SHA-1: 0752b6ba8415ca20e3983641210a5ad15a7501f9 SHA-256: 3f86e43df0aaa33a91a8dd3d0197a9cc6dab7e4507cff03791ebe5c1f849d1a8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency ('Robux') and directs users to a suspicious URL. The ML classifier strongly indicated maliciousness, and the PDF's structure and content align with social engineering tactics to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent, likely leading to a payload download or further phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/get-me-robux-for-free-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/how-to-get-robux-on-roblox-for-free-ipad_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-site-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-robux-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/redline-32-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-voohack-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-money-hack-tool_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-10-codes-for-roblox-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/clone-tycoon-2-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-roblox-para-volar_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-how-to-get-free-lvl-7-hacks_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-card-twitter_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-free-robux-without-human-verification-2021_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_off00002f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F47 22036 bytes
SHA-256: 54d915fb5113a3c02daa93c1657513f89b374465208a3badc0606b63b1764562
font_01_sfnt_off00005fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAE 19016 bytes
SHA-256: feaab394b075859e694c399921b9b5bf0523619dd427b317c2360992586738dc

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