Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec259e20d32a9a12…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 17:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1ca443f238ced4472efb97f91ca351e0 SHA-1: 547ec7954dabf090f1d981e2d14e5ae604d2aa2a SHA-256: ec259e20d32a9a12a95cff1b08df328a2c63cb11bf53e63ec504541d9ea843c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/free-robux-gift-card-game-hack, disguised as a lure for free Robux or game hacks. The presence of a download button lure and the overall structure strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators 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/431946152/free-robux-gift-card-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/i-am-hacking-roblox-high-jump_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/como-tener-mucho-dinero-en-jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/instagram-free-coin-master-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
font_00_sfnt_off00002f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F54 22648 bytes
SHA-256: 465cd6593dc55143986cc995e8a170add28f87a0f59424aea9b643d02c550876
font_01_sfnt_off000061a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A3 19112 bytes
SHA-256: 5d60391c622a458b14b8fa69ffb952c1d3cbb56e74fa158a34f16b9612198a82

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