Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bc0665a4838f57…

MALICIOUS

PDF

46.8 KB Created: 2021-06-11 12:56:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6690a8cdfc7d9fe0d6cbdaf9d61e633a SHA-1: 6956367101d8ee9387afa92f6c319fffffe4c980 SHA-256: 18bc0665a4838f57632e36c52fa20d5f83f29d6439642f6510dd096f250a0984
100 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically targeting users with lures related to game cheats and hacks. The presence of a visual download button further supports the malicious intent of directing users to download potentially harmful files. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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/cheat-engine-6.4-speed-hack-roblox-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-change-your-name-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-infinite-health-hack-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/best-roblox-hack-executer-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/pubg-uc-and-bp-hack_GM1330123889.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/pubg-uc-hilesi_GM1330123889.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/ways-to-earn-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_off00005016.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5016 23868 bytes
SHA-256: aa140a88c4b155534d1fde24bbeb659951bd3f9f741265afe510c15eab4e29cd
font_01_sfnt_off00008658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8658 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off0000901a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901A 19504 bytes
SHA-256: fd8dcafbda93cf737c58a3105759bdb544b4889245028f930fb46b3a87d8ba50

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