Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b85aa1c0f9736d…

MALICIOUS

PDF

48.9 KB Created: 2021-06-09 07:15:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bcbab61c4da99705d58a4a3e1d5e2ff2 SHA-1: ad4947b9625c8dacdb9109b76ad1d880df54cf72 SHA-256: 23b85aa1c0f9736dbc111c3add85d1b3491ff60901ee222a410c708cd5891b48
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to game cheats and hacks. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document, likely to download or execute a payload from one of the linked URLs. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/apex-spice-free-robux-game-hack
    • http://gc-sistemas.com.ar/images/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/roblox-admin-commands-dll-hack_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/hacks-minecraft_GM479516143.pdf
    • http://gc-sistemas.com.ar/images/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/redeem-roblox-card-free_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/coin-master-invite-friends-hack_GM406889139.pdf
    • http://gc-sistemas.com.ar/images/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/websites-that-give-you-free-robux_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/daily-coin-master-free-spin-apk_GM406889139.pdf
    • http://gc-sistemas.com.ar/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/pasos-para-hackear-coins-master_GM406889139.pdf
    • http://gc-sistemas.com.ar/images/coin-master-hack-pro-gamers_GM406889139.pdf
    • http://gc-sistemas.com.ar/images/toolbox-premium-apk_GM479516143.pdf
    • http://gc-sistemas.com.ar/images/whats-robux_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/coin-master-hack-spins-2021_GM406889139.pdf
    • http://gc-sistemas.com.ar/images/free-roblox-codes_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/abd-roblox_GM431946152.pdf
    • http://gc-sistemas.com.ar/images/coin-master-hacks-no-downloading_GM406889139.pdf
    • http://gc-sistemas.com.ar/images/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdf
    • http://gc-sistemas.com.ar/images/coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005108.bin
f56f20ff49a3154f1ee3fc338a0794f4fd236c5eacce2ccf2f18915e69ff772b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5108 26936 bytes
font_01_sfnt_off00008fa9.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA9 3884 bytes
font_02_sfnt_off00009c50.bin
298a222ba35f304fae77d8168e94aae6500f457e6f800b41e479f553451d84ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C50 18308 bytes

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