Malicious PDF — malware analysis report

Static analysis result for SHA-256 401e13003a9f09ad…

MALICIOUS

PDF

46.0 KB Created: 2021-06-08 20:20:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 647403ca10764cb50525e2bdf621370a SHA-1: f5d6fc799f32ad3b54185b50f051c0f661370920 SHA-256: 401e13003a9f09ad0b37f41e1bf3f5b6864bd68129c9617fc19305816394d25c
142 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to "free Robux" or "free Coin Master spins" lures. The document also displays a fake CAPTCHA, indicating a social engineering attempt to trick the user into clicking these malicious links. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-hack-get-unlimited-gems-and-gold-game-hack PDF link annotation
    • http://io24.com.ar/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/cm-spins_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-actually-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/is-roblox-cheat-engine-safe_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-hack-for-wls3_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/pubg-uc-jazz-cash_GM1330123889.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-follower-bot-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD3 27552 bytes
SHA-256: 0f37637a06e40f5d3165f2dd6140ab46945771bb136e1985bd35230852931e5d
font_01_sfnt_off00008eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEE 19024 bytes
SHA-256: 925cf6ef010d6a24d676f5d5c9396c62fe0d69099bd666670cddfeb85bfa1d35

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