Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb68d25ecb5f3d3e…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 02:29:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7b96cb372f87c4a9581fe448382380dd SHA-1: a126b401b5352e0ff6711bd61a3408cdc034c72d SHA-256: cb68d25ecb5f3d3e8a25b171c701ec0b5ded954631ed82cda3834ba396cae32f
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are part of a link farm designed to appear as search results for 'Free Robux'. The document body, though heavily obfuscated, contains references to 'Free Robux No Survey No Download No Verification' and a URL pointing to a similar offer. This indicates a social engineering attempt to trick users into clicking malicious links, likely leading to malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-robux-no-survey-no-download-no-verification-game-hack
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/roblox-vehicle-simulator-hack-2021_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/robux-pin-free-no-verification_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-install-cheat-engine-for-roblox-no-winrar-required_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-get-free-hair-roblox_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/can-you-get-minecraft-for-free_GM479516143.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/free-robux-group_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-download_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/roblox-free-recompense_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/roblox-hack-phantom-forces-cheat-engine_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/real-minecraft-for-free_GM479516143.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/can-you-get-legitimate-free-robux_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/khaos-robux-hack_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/how-to-get-shirts-for-free-on-roblox_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/roblox-jailbreak-hack_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/will-minecraft-dungeons-be-free_GM479516143.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/cheat-engine-original-download-roblox_GM431946152.pdf
    • http://cbt.man1metro.sch.id/__statics/gudangsoal/files/roblox-hack-free-robux-on-ipad_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005115.bin
8bea164e5cba8bd337d507314bf3368e9da174aeea5ac63260c328e9338e8136		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5115 26004 bytes
font_01_sfnt_off00008c27.bin
2fb72cc59d609977e0e0f2d37edf9c389ac824f5e020efaf68856858e8b7f04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C27 19472 bytes

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