Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e628da348a9d265…

MALICIOUS

PDF

47.4 KB Created: 2021-06-10 11:36:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 06e28dfcb4ccb2d35e1e9469590c203f SHA-1: 806e0fa2ed0e95febce7858fb3186a547a5ce1fd SHA-256: 4e628da348a9d2653b0f74481d78866726fb6857ddee9ddaf6077deb3bebfbe5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free generators' for popular games. The primary lure appears to be a Roblox game hack, directing users to a URL hosted on netcdn.tw. The document body, though heavily obfuscated, contains references to this URL and game-related terms, reinforcing the lure. The presence of multiple redirector links and the ML classifier's high confidence score indicate a strong likelihood of malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/431946152/free-star-codes-2021-roblox-game-hack In PDF document text
    • http://library.apsidoarjo.ac.id//repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-download-mac-free_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-roblox-script-executor-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-murder-mystery-2-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e9b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9B 25800 bytes
SHA-256: bab4b23744bd76f91c63d0ea5e5cad8a7abf82e21da8c3045d2720b8b3031a20
font_01_sfnt_off00008aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACA 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off0000947b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x947B 18856 bytes
SHA-256: 9b35be4f10780bcf53c4dcad106083203bcaec886906daba2293131fbbe7b1f7

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