Malicious PDF — malware analysis report

Static analysis result for SHA-256 208d22d878d8484d…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 00:26:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4991caa543520a2276b65157dc1bd2ae SHA-1: 235bd9da070b394ec2b77fd4b564e3fa87d7e87a SHA-256: 208d22d878d8484d5f85db25c202bf6e16cdc712d31b95b3f06335d838d983e9
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a document body that lures users with promises of free in-game currency and hacks for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly suggests maliciousness. The primary IOC is the URL http://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-website-game-hack, which likely serves as a download or redirection point for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/how-to-get-free-robux-on-roblox-website-game-hack PDF link annotation
    • https://digilib.stimlog.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-character-cheat_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-do-you-get-free-roblox-skins_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-gear-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cerberus-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-jailbreak-roblox-noclip_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-studio-ship-parts_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/execute-freerobux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-dragon-ball-rage-all-gamepasses-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-crosshair-decal-hacked_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-obbys-that-work_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
font_00_sfnt_off00002f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5D 22176 bytes
SHA-256: cd8b043bc421d2b6bebe2fd5d9d20e6907a7640197e8accb747c004b11387cb3
font_01_sfnt_off00006076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6076 19376 bytes
SHA-256: 33a7a1c523ec718187f43daba93bda17ea914145d14a015abd435ac1ed3554df

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