Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a374a9e0bf96ae1…

MALICIOUS

PDF

50.9 KB Created: 2021-06-11 01:22:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8e7c805c29971e2c371b2436f6a05e5b SHA-1: a68aa15bf5c80bc549d067a107a8da53a9c3d960 SHA-256: 4a374a9e0bf96ae11227f9f1f02a56e5848638d3cc6aed4b5d9b74f6c7357c43
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically targeting users with lures related to game cheats and currency. The ML classifier also flagged this PDF as malicious. The presence of these links suggests the document is designed to trick users into visiting harmful sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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 https://netcdn.tw/app/431946152/cache-http-www.robuxian.com-free-robux-code-generator-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-god-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/tiktok-free-svg_GM835599320.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/best-free-roblox-screen-recorder_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-rich-accounts_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • https://collectrobux.coIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53EF 27196 bytes
SHA-256: ae72889a2326e2bd655a4a96ffd49229682ccb0a6a689a7f36c56b61e233330d
font_01_sfnt_off00009223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9223 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F34 19992 bytes
SHA-256: 7cfb636b331fd8215995a756540819353806ccbe61a3d51043db58f0fd8535cf

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