Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d86c1bcaeaee7e…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 02:26:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c39227462aa999229844ce0f17b01fe8 SHA-1: 6a84d4ddb7298e0af81fdf406128847c61a85543 SHA-256: d3d86c1bcaeaee7e0f03e514909892859ef6be70cb96595286c7fa2b20c765e9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are SEO-optimized and point to sites offering 'free coins', 'free robux', or 'hacks' for popular games. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm designed to redirect users to potentially malicious sites or phishing pages. No scripts were extracted, but the overall structure and content indicate a lure for users seeking in-game advantages.

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.tw/app/406889139/coin-master-free-coins-link-2021-game-hack
    • http://www.sbairs.com/datas/files/promo-codes-for-free-robux_GM431946152.pdf
    • http://www.sbairs.com/datas/files/roblox-chat-hack-v1-0-script_GM431946152.pdf
    • http://www.sbairs.com/datas/files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • http://www.sbairs.com/datas/files/free-robux-no-human-verification-on-android_GM431946152.pdf
    • http://www.sbairs.com/datas/files/roblox-pokemon-legends-hack_GM431946152.pdf
    • http://www.sbairs.com/datas/files/como-hackear-coin-master-2021_GM406889139.pdf
    • http://www.sbairs.com/datas/files/free-roblox-account-with-ridable-pets_GM431946152.pdf
    • http://www.sbairs.com/datas/files/mcpe-free-download_GM479516143.pdf
    • http://www.sbairs.com/datas/files/coin-drop-master-free_GM406889139.pdf
    • http://www.sbairs.com/datas/files/coin-master-free-blogspot_GM406889139.pdf
    • http://www.sbairs.com/datas/files/daily-free-spins-coin-master_GM406889139.pdf
    • http://www.sbairs.com/datas/files/how-to-get-free-faces-on-roblox_GM431946152.pdf
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-august-2021_GM431946152.pdf
    • http://www.sbairs.com/datas/files/roblox-how-to-play-welcome-to-bloxburg-for-free_GM431946152.pdf
    • http://www.sbairs.com/datas/files/robux-adder_GM431946152.pdf
    • http://www.sbairs.com/datas/files/how-to-get-free-clothes-in-roblox-mobile_GM431946152.pdf
    • http://www.sbairs.com/datas/files/how-to-get-free-tiktok-coins_GM835599320.pdf
    • http://www.sbairs.com/datas/files/redeem-your-free-robux_GM431946152.pdf
    • http://www.sbairs.com/datas/files/coin-master-free-spins-daily-2021_GM406889139.pdf
    • http://www.sbairs.com/datas/files/hack-coin-master-for-iphone_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003085.bin
c81e5dd4b7da6d0f33ef297b027e376cfdf7c5484f5deaa929bff2e52811d1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x3085 22540 bytes
font_01_sfnt_off000062eb.bin
5c6f2b8c8950227f34c0c7c762a0319831c5dcbb819f0110f1dbfe9ff8d1e338
pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 18568 bytes