Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a34c35159659dc…

MALICIOUS

PDF

34.5 KB Created: 2021-06-28 08:36:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 37664702e803a817c1884f11f643bcb9 SHA-1: e4a74695e21f35dd17fcd22a16a3a081d0743774 SHA-256: 65a34c35159659dc994b2b7f380884bbc583633111a95bb2d6223be1dccd979e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which are structured as SEO-optimized links pointing to game-related hacks and free currency. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous links to sites like 'netcdn.co' and 'perpus.masda.ac.id' strongly suggest a phishing or malware distribution campaign. The document body's text and the URLs indicate a lure for popular games like Roblox and Coin Master, aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.co/app/431946152/free-roblox-codes-that-nobody-have-haven
    • http://perpus.masda.ac.id/repository/hack-the-coin-master-game_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/como-tener-robux-gratis-sin-hackear_GM431946152.pdf
    • http://perpus.masda.ac.id//repository/coin-game_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/android-coin-master-3433-apk-hack_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/free-roblox-cmds_GM431946152.pdf
    • http://perpus.masda.ac.id//repository/coin-master-free-soins_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/free-coins-for-coin-master_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/noclip-hack-on-roblox_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/games-that-give-free-robux_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/roblox-hack-no-verification-or-survey-or-download_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/pig-master-coin-master-free-spin_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/free-20210-robux_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdf
    • http://perpus.masda.ac.id//repository/roblox-tracker_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-on-roblox-no-builders-club_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/free-items-roblox-2021-list_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdf
    • http://perpus.masda.ac.id//repository/c
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003019.bin
3a1d2d6b8d4d0adbd3f32ff0e731947e8ca278db7c7cf1867fe7a1ca4400082b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3019 21784 bytes
font_01_sfnt_off00006033.bin
6f12fe6871d4ef22ced43bb27a3a4b78b4a18fe88bf4fd3e7bbf95bafb6a30b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6033 19612 bytes

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