Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4666bf860866861…

MALICIOUS

PDF

54.4 KB Created: 2021-06-07 15:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e988faaaf560327cff73908801e92908 SHA-1: 58f48e0a3aa661640957d52994bba0461dccf354 SHA-256: f4666bf860866861797efd5ad200c84e08dcef91c56ecf98b5b0b5787ca85dda
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that form a link farm, likely intended to direct users to malicious websites offering game hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a 'download button' lure further supports a malicious intent. The document body, though heavily obfuscated, contains references to game hacks and a URL, reinforcing the phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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.tw/app/431946152/horrnoclip-hacks-roblox-game-hack
    • http://linens.kiev.ua/images/minecraft-windows-10-hacked-client_GM479516143.pdf
    • http://linens.kiev.ua/images/free-spin-coin-master-link-2021_GM406889139.pdf
    • http://linens.kiev.ua/images/how-to-hack-in-arsenal_GM431946152.pdf
    • http://linens.kiev.ua/images/roblox-hack-download_GM431946152.pdf
    • http://linens.kiev.ua/images/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://linens.kiev.ua/images/how-to-get-free-robux-generator_GM431946152.pdf
    • http://linens.kiev.ua/images/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://linens.kiev.ua/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://linens.kiev.ua/images/coin-master-free-spins-link-may-2021_GM406889139.pdf
    • http://linens.kiev.ua/images/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdf
    • http://linens.kiev.ua/images/where-to-get-free-robux_GM431946152.pdf
    • http://linens.kiev.ua/images/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://linens.kiev.ua/images/hack-coin-master-for-free_GM406889139.pdf
    • http://linens.kiev.ua/images/earn-free-robux-today_GM431946152.pdf
    • http://linens.kiev.ua/images/free-robux-script_GM431946152.pdf
    • http://linens.kiev.ua/images/coin-master-cheats-without-verification_GM406889139.pdf
    • http://linens.kiev.ua/images/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdf
    • http://linens.kiev.ua/images/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://linens.kiev.ua/images/minecraft-free-online_GM479516143.pdf
    • http://linens.kiev.ua/images/coin-master-hacksco_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000516a.bin
12caf50eba464b490e2943703f213605f584b01c5a1b32f42166dd03f57ea989
pdf-font-stream PDF embedded font (sfnt) at offset 0x516A 24556 bytes
font_01_sfnt_off000089e1.bin
db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
pdf-font-stream PDF embedded font (sfnt) at offset 0x89E1 12800 bytes
font_02_sfnt_off0000b1bd.bin
564eb9d662bb6d806dc4ab52141174f286529d352f9d2d703e0f5442b2bb8af6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BD 18480 bytes