Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3d9eaf56477255…

MALICIOUS

PDF

33.1 KB Created: 2021-07-04 11:43:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1a7994a6b953d43e2d12dde3605c880e SHA-1: 396f0aa418a5b699b15b6ab463c4cc5f198e4f98 SHA-256: 1b3d9eaf56477255ebdce29268c04cda6ddeddc319078dfb2eed31c94c835048
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising free game hacks and currency. The primary lure appears to be related to Minecraft and Roblox, aiming to trick users into visiting these malicious sites. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/479516143/free-minecraft-coins-game-hack In PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/wie-kann-mann-hacken-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-cs-go-aim-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-redeem-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-cool-roblox-templates_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/www-coin-master-hack_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_off00002f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3D 21932 bytes
SHA-256: 7ad26b78e61cdbe99f112a2759bacda5176ba6065b6cf1861400a6d8ced5f698
font_01_sfnt_off00005f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6C 17996 bytes
SHA-256: 62b33825d77a1aa8942f78c87daf4acfd1b4f6aff03710f3f9c2eec2f3f5493c

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