Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8e0febc7dc379a…

MALICIOUS

PDF

45.9 KB Created: 2021-05-14 13:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 40fdf7a9b27ea60e16628b4c5afc5ded SHA-1: 2422a8a30f125c0eeca1bc899404c2a05f78cd26 SHA-256: 4f8e0febc7dc379a86ccb349b49f2d4182bb7c0924674ae69b5218b96b9385ab
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to game hacks and virtual currency generators. The presence of a "download button" lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the structure suggests a link farm designed to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/406889139/coin-master-online-hack-download-game-hack
    • https://and.co.id/assets/CKImages/files/best-site-for-free-coin-master_GM406889139.pdf
    • https://and.co.id/assets/CKImages/files/free-robux-gift-card-generator_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/can-you-really-hack-coin-master_GM406889139.pdf
    • https://and.co.id/assets/CKImages/files/rewardex-robux_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/coin-master-hack-pc-free_GM406889139.pdf
    • https://and.co.id/assets/CKImages/files/free-robux-games-on-roblox_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/links-for-free-spins-for-coin-master_GM406889139.pdf
    • https://and.co.id/assets/CKImages/files/robuxlove-net-free-robux_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/earn-free-robux-today_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/can-i-have-robux_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/get-free-gold-cards-in-coin-master_GM406889139.pdf
    • https://and.co.id/assets/CKImages/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdf
    • https://and.co.id/assets/CKImages/files/complete-offers-for-robux_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/roblox-hack-me-robux_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/https-rbx-place-rewards_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/roblox-free-robux-hack_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/free-robux-2021-no-human-verification_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/coin-master-links-that-don-t-expire_GM406889139.pdf
    • https://and.co.id/assets/CKImages/files/free-unlimited-coins-for-coin-master_GM406889139.pdf
    • https://and.co.id/assets/CKImages/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ca5.bin
a6b2b6c4688165ae3c6be92e6c4177e434bbbfe842ea83cf0a0fb51ba3076276
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA5 24700 bytes
font_01_sfnt_off00008448.bin
c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x8448 3560 bytes
font_02_sfnt_off000090ce.bin
a91dad97805a851d4d9dd61317d1e51430e69d3f7e26ebf67d6b1ffe25e57ed6
pdf-font-stream PDF embedded font (sfnt) at offset 0x90CE 18296 bytes