Malicious PDF — malware analysis report

Static analysis result for SHA-256 083dfc850a815084…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 05:51:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 124aeaedaeb51a956668d7d6e552c21b SHA-1: 9f19ff6599b9da925718928c8cf7ffa3a11e41d0 SHA-256: 083dfc850a815084aa0bd9e7b7de8954a14c1b004b66d1ca96d1cb964c88db83
162 Risk Score

Malware Insights

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

This PDF document employs a lure to trick users into downloading malicious content, disguised as game cheats or free in-game currency. It contains a mass of external links, many of which are SEO-optimized PDF links, and explicitly requests sensitive recovery secrets or private keys. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.online/app/406889139/descargar-hack-coin-master-game-hack
    • http://perpustakaan.urindo.ac.id/repository/free-robux-real-working_GM431946152.pdf
    • https://perpustakaan.urindo.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/free-robux-gen_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/free-mojang-account-with-minecraft_GM479516143.pdf
    • http://perpustakaan.urindo.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-chip_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/robux-com-free-robux_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/como-hackear-coin-master-espaol_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/coin-master-rewards_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdf
    • https://perpustakaan.urindo.ac.id/repository/minecraft-hacked-apk_GM479516143.pdf
    • http://perpustakaan.urindo.ac.id/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000513f.bin
c56b3d3feba8fe56d238609371602f95d6888463905adc9ee42f7159cc490cb1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x513F 25320 bytes
font_01_sfnt_off00008bbd.bin
75c3a8e6f5c68e0746f893c922e57fd7e888a21fb038f9ae3eedb0a197a59e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBD 3400 bytes
font_02_sfnt_off000096e1.bin
8e05f9f32595a35b5a9f3361bee3fb11860dee14ab597e5c6e5f24d8016f84fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E1 18172 bytes

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