Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6c17387f149c29…

MALICIOUS

PDF

48.4 KB Created: 2021-06-09 14:55:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0beec6f527aebc6bec649b47ef4f9472 SHA-1: 89d30c5e4e9d9be81389152ba438ea55a9dbb405 SHA-256: 7d6c17387f149c29e9cb2d3563b6a9a4fe96f578b6684b3a0b619f66ab76084c
102 Risk Score

Malware Insights

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

The PDF file contains a high number of external links, many of which are related to game cheats and in-game currency, suggesting a lure for potentially unwanted or malicious downloads. The presence of a 'download button' heuristic further supports this, indicating a deceptive user interface. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/robux-free-2021-sans-verification-humaine-game-hack
    • https://www.knjigebuducnosti.com/files/free-daily-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/do-coin-master-hacks-work_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/synapse-roblox-free_GM431946152.pdf
    • https://www.knjigebuducnosti.com/files/free-spin-link-in-coin-master_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-and-coins_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/robux-free-com_GM431946152.pdf
    • https://www.knjigebuducnosti.com/files/roblox-app-free-download_GM431946152.pdf
    • https://www.knjigebuducnosti.com/files/earn-robux-today-earn-robux-today_GM431946152.pdf
    • https://www.knjigebuducnosti.com/files/coin-master-free-cards-2021_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/minecraft-pe-hacked-client-download_GM479516143.pdf
    • https://www.knjigebuducnosti.com/files/coin-master-hack-no-human-verification_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/coinmasterdailyfreespins-com_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/coin-master-daily-spin-free_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/http-bit-ly-coin-master-hack_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-youthnow_GM406889139.pdf
    • https://www.knjigebuducnosti.com/files/robux-hack-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d7.bin
1aed7e793587870dce4e7ddb0d6335d444b10a39628f393e9c28404b253df3da
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D7 25800 bytes
font_01_sfnt_off00008dd1.bin
baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD1 2844 bytes
font_02_sfnt_off00009793.bin
52ff210d778b1f7c438d46cff1aacce2d7d25d1c37e3dcc3af53fe37a3cd2719
pdf-font-stream PDF embedded font (sfnt) at offset 0x9793 19260 bytes