Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a8fc089710fe37…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 19:39:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dc6eaf1724d3680a8780cccbe2d71381 SHA-1: ad93fb10c2a81e47ca3d459b22a45c69285013c6 SHA-256: 35a8fc089710fe374176c12834dd1e7dc9f9f9092e901748b75415121eabbc44
142 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external resources related to free in-game currency and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'SE_LOLBIN_RUN_COMMAND' suggests the potential execution of commands. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially malicious websites via these links, which could lead to phishing or the download of further malicious content.

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.tw/app/406889139/coin-master-free-spins-cheat-game-hack
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/free-robux-websites-that-work_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/how-to-get-free-roblox-money-2021_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdf
    • https://library.sttbandung.ac.id/repository/free-robux-hack-us_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://library.sttbandung.ac.id/repository/get-me-free-robux_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/master-coin-free-spin_GM406889139.pdf
    • https://library.sttbandung.ac.id/repository/roblox-broken-bones-2-cheat_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdf
    • https://library.sttbandung.ac.id/repository/roblox-re_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/stop-teleport-hacking-roblox_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • https://library.sttbandung.ac.id/repository/how-to-hack-roblox-robux-with-cmd_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/is-minecraft-free-on-computer_GM479516143.pdf
    • https://library.sttbandung.ac.id/repository/roblox-how-to-get-free-gear-2021_GM431946152.pdf
    • https://library.sttbandung.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdf
    • https://library.sttbandung.ac.id/repository/coin-master-hack-review_GM406889139.pdf
    • https://library.sttbandung.ac.id/reposit
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb2.bin
af21f92cbf7aa4b1836c98dbaf11e7f161d257b1edbf9d118fbd74e10b87bdb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB2 22324 bytes
font_01_sfnt_off0000603d.bin
31b040f11d31e2c25a3918167828aea55bdad87c8eae0a9348126ed232a1d2b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x603D 18340 bytes

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