Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4b7199748b6b92…

MALICIOUS

PDF

51.3 KB Created: 2021-06-11 07:52:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b9563bab9d24a2d01d84c9b733b0d0f7 SHA-1: 5812ee841cadc3515c9ff33c155e69fa0ab8e840 SHA-256: fb4b7199748b6b9270b3375d939e6eb66da4138658849b0d3db2db5b3fcfb1d9
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and is designed to lure users into clicking on a "game hack" generator. The primary malicious link identified is https://netcdn.tw/app/431946152/roblox-rux-hack-game-hack. The document body, though partially corrupted, contains references to game hacks and download prompts, reinforcing the lure. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

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/roblox-rux-hack-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/free-faces-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-earn-free-robuxs_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/tiktok-free-to-watch-online_GM835599320.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-admin-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-roblox-accopunt-passowrds_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/robux-gainer_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-on-roblox-2021-no-hacks_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-free-gui-op_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_004_off00005284.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5284 38632 bytes
SHA-256: 891a8c6aec5dbd75290f935a98f9b68b2c18551a47de4503c7ac5c2b7af92982
font_01_sfnt_off0000a660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA660 18320 bytes
SHA-256: fa424f86a9ddd472d540fc30f07119be4b576a9306b5f7bb82c207f2bb92a2b4

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