Malicious PDF — malware analysis report

Static analysis result for SHA-256 f400777d5db35238…

MALICIOUS

PDF

43.6 KB Created: 2021-06-13 14:51:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f853281e141cbc9725745a2e849eb829 SHA-1: eb6e8fe5eee903a9d9910e821747f95459f752fe SHA-256: f400777d5db3523880b3cabf2ffb3058b792a14fdfe6f9d523b37b24357d4119
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to appear as search results for popular games and free items. The presence of a fake CAPTCHA lure and a download button strongly suggests an attempt to trick the user into downloading a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.co/app/431946152/free-robux-2021-codes-game-hack PDF link annotation
    • http://firesafetyservices.biz/images/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-free-items-in-roblox-live_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/hack-for-roblox-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-dominus-site-robloxcom_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E65 24484 bytes
SHA-256: 3979ddc7722ece598d91071bf54985b3c958f56f1db678f286ac4089f16781e4
font_01_sfnt_off000086a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A5 18588 bytes
SHA-256: e52614e8b0058889430efc095fa3888e105e0368c4450eba3f77abd7c1fc3ec8

Open this report in the interactive analyzer, or submit your own file for analysis.