Malicious PDF — malware analysis report

Static analysis result for SHA-256 b058490b8e53a388…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 16:17:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6d885e6f8f4fc981a67d278acc2de2c9 SHA-1: 89c81ff6116fd766f54be4998277432389c1298f SHA-256: b058490b8e53a3885a71ef8e291d3e08265ab1021a6b4015daea377a3f7d93e3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which are SEO-optimized and point to sites offering 'free spins' or 'free robux', indicating a scam or phishing attempt. The presence of a 'download button' heuristic further supports the lure of a malicious download. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to exploit users.

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/coin-master-free-spins-youthnow-game-hack
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-for-real_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-robux-glitch_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/in-which-country-pubg-uc-is-cheapest_GM1330123889.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-app-android_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-facebook-page_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/robux-matchcomfree-robux_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-robux-only-username-no-human-verification_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-rewards-coin-master_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-for-kids_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-generator-hack_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/daily-free-spins-coin-master-heaven_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/roblox-gang-rape_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/latest-coin-master-free-spins-link_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-robux-survey_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-mgui-roblox_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-robux-for-kids_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000515f.bin
42a2a4ef358610c87481c98979d55cf45e3753a6b5b3ecf31a9d86cdd9fa9ad1
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515F 24856 bytes
font_01_sfnt_off00008ab2.bin
2d9e93df29aa51ca1a7d67cf2404b131feb62ab03f4d0f4d21f6bd2b7fc99d70
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB2 18516 bytes