Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cda5b1b0a97bf8…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 20:52:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a2b208124f5c6d850050276fb799eb54 SHA-1: fb0f26d8e1d14b71a4a8fef72a89decf4dc84e5c SHA-256: b5cda5b1b0a97bf8a3a2a02d7fff7ca15b3da92ec719cdcb829865abfa1c8e41
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/freespinandcoin-blogspot-com-game-hack, which is designed to lure users with promises of game hacks and free currency. The document body and embedded URLs reinforce this lure, indicating a phishing or scam attempt. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence score suggest a high likelihood of this document being used for malicious redirection.

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/freespinandcoin-blogspot-com-game-hack In PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/roblox-shotgun-lua-hack-command_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/idenity-fraud-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/roblox-hack-with-cheat-manager_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/cheat-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/roblox-hack-lua-scripts_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/roblox-hack-tool-variables-search_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/arsenal-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/best-hack-for-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/rbxrich-free-robux_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
stream_002_off00003005.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3005 22224 bytes
SHA-256: a750c0285b9a1eef55aa5a19e7e1ecb0c6db1615c260dcafa34e62fd349d9d72
font_01_sfnt_off000061b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B9 18900 bytes
SHA-256: 21188b99be3b8f5d7031cb1e7beeffd6c85dae88b9ee67696710ab04d191542f

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