Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ca733ac365e1eb…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 08:05:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 987fbc868d93b97d12940798f3fcf3a9 SHA-1: dfc6d8bef4c5c28b219d16c427216fe580bc7941 SHA-256: 81ca733ac365e1eb515dc114cea0ba5d0a122eb6daf41e33d66f9dea02f70ae6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple URLs pointing to sites offering game-related cheats and downloads, such as 'free-robux-codes.us-game-hack'. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect the user to a malicious download or phishing site. No scripts were extracted from this sample, but the overall pattern indicates a social engineering lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 3

  • 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.co/app/431946152/free-robux-codes.us-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-free-full-download_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-robux-games-on-roblox-link_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-roblox-cards-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-noclip-cheat-engine-download_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-hack-script-walkspeed_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-lifting-simulator-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/infinite-jump-hack-roblox-2021-november_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/cheat-engine-lua-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-et-free-robux-on-roblox-and-bc_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-minecraft-skin-packs_GM479516143.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_off00003082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3082 21900 bytes
SHA-256: 7c413adf58b0240901772e8533abbc6e25238c92e863ca242faaa5ca18d549d7
font_01_sfnt_off000060e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 18956 bytes
SHA-256: bc423e132dd0e8de619128782b3ca416d33488b68fa18885eef595d1bfe785b1

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