Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c30f573cef548b8…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 19:47:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2681ccc187b47c0fadee5c9e034611df SHA-1: 189023985dad4b81a26ec376be8e9df08efd441f SHA-256: 1c30f573cef548b8af21485f5e52e6d3e2118d699a5328e73d24a6288bde7c5d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'free Robux'. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-code-hack-game-hack, which is flagged as malicious. The document's structure and embedded links suggest it is designed to trick users into visiting malicious sites, likely for credential harvesting or to download further malware. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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/406889139/coin-master-code-hack-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheat-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/watch-videos-and-complete-offers-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/tiktok-free-or-paid_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-space-outpost-tycoon-script-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-converter_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/tiktok-free-likes-app_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/accesories-hacks-royale-high-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-free-robux-ad_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/public-enemy-sun-prairie-coin-master-free-spins_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
stream_002_off0000326d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326D 22220 bytes
SHA-256: 0f9e2e299c65edb380c55688bdbe4295929814993fb3d5c8ef9985553c1ced9c
font_01_sfnt_off000063b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B9 18180 bytes
SHA-256: 6f4994608566ebd9397f6cc175ec3337bd2a095019109335e6b17d055b146122

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