Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c10f219f183cc64…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 08:50:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dd3c738c5d89a0d388faf5fdb1cf4ab8 SHA-1: 5efa2387211be18f0cb89958f4db66f7ce48ce60 SHA-256: 4c10f219f183cc648b9840c0fe345fceffe8c55b4fd2721e9c5453f883fcc255
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 point to SEO-optimized PDF files related to game cheats and hacks. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to lure users to external resources. The primary URL, https://netcdn.online/app/406889139/coinmaster-game-hack, likely serves as the initial download point for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coinmaster-game-hack
    • https://ibelive.com.tw/image/data/files/coin-master-hack-without-downloading-apps_GM406889139.pdf
    • https://ibelive.com.tw/image/data/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdf
    • https://ibelive.com.tw/image/data/files/i-cant-get-free-spins-coin-master_GM406889139.pdf
    • https://ibelive.com.tw/image/data/files/how-to-gift-robux-on-mobile_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://ibelive.com.tw/image/data/files/robux-miner_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/coin-master-free-coins-twitter_GM406889139.pdf
    • https://ibelive.com.tw/image/data/files/free-robux-card-codes_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/minecraft-hacks-ps4_GM479516143.pdf
    • https://ibelive.com.tw/image/data/files/codes-how-to-get-free-robux_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/coin-master-hack-for-android_GM406889139.pdf
    • https://ibelive.com.tw/image/data/files/roblox-hack-codes_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/pasos-para-hackear-coins-master_GM406889139.pdf
    • https://ibelive.com.tw/image/data/files/smart-lodhi-coin-master-hack_GM406889139.pdf
    • https://ibelive.com.tw/image/data/files/free-minecraft-alts_GM479516143.pdf
    • https://ibelive.com.tw/image/data/files/free-robux-for-kids-no-verification_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/roblox-hacked-version-download_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/rewards-robux_GM431946152.pdf
    • https://ibelive.com.tw/image/data/files/instant-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f6a.bin
4b8754fa37cef22a545d25398e5d9d4f8e6af9ea9e75ba50be800e1424373c97
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F6A 24572 bytes
font_01_sfnt_off000087f0.bin
af208cdb45bd073d7b5ba90b2b5d7fe18c625e7bd90d48e59b2ee82d337b8146
pdf-font-stream PDF embedded font (sfnt) at offset 0x87F0 17808 bytes