Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4e9a979b11291e…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 15:01:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ea2da90a36d621b7c10216c2373829b3 SHA-1: fbd014545955e9f342b2a48bc4332ed8f147d4e8 SHA-256: 0a4e9a979b11291e8e8125ffdaf3de122e28a33598eb1605caf7bb8dca24e477
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are SEO-optimized to appear as legitimate guides for popular games like Coin Master and Roblox. The primary external URL, http://netcdn.tw/app/406889139/coin-master-free-spins-facebook-game-hack, suggests a lure for free in-game items. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links are generated to create a link farm, a common tactic for SEO manipulation or distributing malicious content. The ML_NYX_PDF_MALICIOUS score further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-facebook-game-hack
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/free-robux-on-iphone_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/how-to-get-free-stuff-on-roblox_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/how-to-get-2021-robux-free_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/how-to-hack-people-on-roblox_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/minecraft-building-hacks_GM479516143.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/how-to-get-minecraft-java-free_GM479516143.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/coin-master-spin-ml_GM406889139.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/free-roblox-redeem-card-codes-2021_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/robux-generator-no-human-verification-or-survey_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/free-robux-without-any-verification_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/how-do-i-get-free-robux-on-my-ipad_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/free-card-link-coin-master_GM406889139.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/roblox-getting-hacked_GM431946152.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/minecraft-pc-free_GM479516143.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/coin-master-card-collection-link_GM406889139.pdf
    • https://elearningmts.al-ahliyah.id/__statics/gudangsoal/files/minecraft-games-to-play-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030ae.bin
fcde5da3b6265599878b3d30d58b7c950ae96e5646935fb6383997d73dd5719e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30AE 22164 bytes
font_01_sfnt_off000061be.bin
60d2bdc76bcd03856ff56843c76a1045165bedbcd3c7078909a454fabf5c0968		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BE 18504 bytes

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