Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a0f89ddd38f777…

MALICIOUS

PDF

34.9 KB Created: 2021-06-22 01:14:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 94cd5f5c96fcf5dc233b3344c35b26cd SHA-1: d6b14977b6c64844524bf469253118ae7b53dce7 SHA-256: c4a0f89ddd38f777f9c7f66a514badfb59d65bb1fc8b291811ac9cba62f25205
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering free in-game currency or items. The primary URL http://netcdn.co/app/406889139/ear-free-spins-for-coin-master-game-hack suggests a lure for potentially malicious content or phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/406889139/ear-free-spins-for-coin-master-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/cell-can-we-get-free-robux-dbz_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-make-hacking-scripts-in-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-no-password-on-ipad_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-how-to-get-an-item-for-free_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-face-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-how-to-get-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-people-easy-on-roblox-web-site_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-on-roblox-2021-easy_GM431946152.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
font_00_sfnt_off0000334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x334F 22692 bytes
SHA-256: 6ca097b32fe7c1ab88f6260546db3b130d7974b8a695a251367e27d70c18313e
font_01_sfnt_off0000664a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664A 18176 bytes
SHA-256: 8cb6e5092b491550e7b215afb87da4ecb4c91e5b5bb3d5caa4fd4e6f3eb8d81f

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