Malicious PDF — malware analysis report

Static analysis result for SHA-256 b917c50673bd21f0…

MALICIOUS

PDF

46.5 KB Created: 2021-05-16 14:08:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b652e3d96779c86233ac759c8796fe3d SHA-1: 117da975d0910f698abc62f44dcd69fcdab57281 SHA-256: b917c50673bd21f0d1ded1844697acaa2fb70c4d29c3ea3d650ad91dd44546c9
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a call-to-action phrase, attempting to trick users into downloading files presented as game cheats or hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/bux-free-robux-game-hack
    • https://www.yantan.com.tw/upload/files/daily-coin-master-link_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/coin-master-hack-without-verification-code-2021_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/coin-master-free-spins-link-download-today_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/free-spin-coin-master-hack-2021_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/free-roblox-executor-no-key_GM431946152.pdf
    • https://www.yantan.com.tw/upload/files/free-stuff-on-roblox_GM431946152.pdf
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://www.yantan.com.tw/upload/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdf
    • https://www.yantan.com.tw/upload/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/coin-master-mod-apk-2021_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/robux-free-gift-card-org-hack_GM431946152.pdf
    • https://www.yantan.com.tw/upload/files/pasos-para-hackear-coins-master_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/how-to-get-more-spins-on-coin-master_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/free-robux-generator-without-verification_GM431946152.pdf
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-easy_GM431946152.pdf
    • https://www.yantan.com.tw/upload/files/coin-master-coins_GM406889139.pdf
    • https://www.yantan.com.tw/upload/files/free-robux-without-offers_GM431946152.pdf
    • https://www.yantan.com.tw/upload/files/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aea.bin
efb68db6b2247dbaf5a373df8279a11a3a177e7f6ff2ac7d046bee3628645417
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEA 25968 bytes
font_01_sfnt_off00008769.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8769 3884 bytes
font_02_sfnt_off00009411.bin
48dadac1a540eb24f39d188e0eb07df2fd2c4cea4184d8a92cbd726ce4786484
pdf-font-stream PDF embedded font (sfnt) at offset 0x9411 18012 bytes