Malicious PDF — malware analysis report

Static analysis result for SHA-256 45020e3900c9a2b3…

MALICIOUS

PDF

37.8 KB Created: 2021-07-06 17:52:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a446dcb71f2a7c56c67f72cb2bafac11 SHA-1: 30b9c05a2855acf97b4ad88acac3098ec48bc51d SHA-256: 45020e3900c9a2b31b764a897ec12009ef9fced81bd32535162995aea8a7a60f
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 legitimate content. The primary URL http://netcdn.tw/app/406889139/coin-master-hack-2021-apk-game-hack and other linked PDFs suggest a lure for users seeking game cheats or hacks, likely leading to malware downloads. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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-hack-2021-apk-game-hack
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-modded-minecraft-server-hosting_GM479516143.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/coin-master-free-spins-without-verification_GM406889139.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/twitter-coin-master-free-spins_GM406889139.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-roblox-codes-2021_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/coin-master-unlimited-spin-link_GM406889139.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/roblox-no-download-hack_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-minecraft-games-for-kids_GM479516143.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-robux-no-scam_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-robux-legit-works_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-roblox-clothes-and-hair_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/roblox-hide-and-seek-cheats_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/how-to-get-free-robux-in-2021_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/game-give-free-robux_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/minecraft-java-edition-free-download-for-android_GM479516143.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-pet-treats-coin-master_GM406889139.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/wahoogaming-co-free-robux_GM431946152.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/android-coin-master-hack-2021_GM406889139.pdf
    • https://elearning.man1bengkalis.id/__statics/gudangsoal/files/free-coins-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033ca.bin
b38557d33b7910135c5aaec9f85c685d84e83a9260116d7b70c7bc879b8b211f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33CA 22512 bytes
font_01_sfnt_off000065d0.bin
c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 2896 bytes
font_02_sfnt_off00006fb5.bin
9ee7f6e729eaa8ccfa60f836f488dcd9dbdf367b2dcb4736acc286b6369c8b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB5 18580 bytes

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