Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a1f6422053816f…

MALICIOUS

PDF

48.5 KB Created: 2021-05-19 18:38:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8523c320ba1aea3c406ecef857d56949 SHA-1: 741f254102f71e126e3d7222ae1a39804f6e0f7b SHA-256: d9a1f6422053816fa625e017bd28a20c5eb31f4ff2134ddfddbe69990c8d0311
102 Risk Score

Malware Insights

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

This PDF document contains a significant number of external links, many of which are disguised as PDF files hosted on suspicious domains. The ML classifier also flagged this document as malicious. The presence of a 'download button' heuristic further suggests a user-interaction-based lure. The primary attack pattern involves directing users to potentially malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/431946152/roblox-inappropriate-game-hack
    • http://pianoservice.com.ua/images/free-spin-coin-master-link-today_GM406889139.pdf
    • http://pianoservice.com.ua/images/how-to-exploit-roblox_GM431946152.pdf
    • http://pianoservice.com.ua/images/archery-master-3d-coins-hack_GM406889139.pdf
    • http://pianoservice.com.ua/images/robux-only_GM431946152.pdf
    • http://pianoservice.com.ua/images/how-to-get-free-cards-for-coin-master_GM406889139.pdf
    • http://pianoservice.com.ua/images/free-roblox-groups-with-funds_GM431946152.pdf
    • http://pianoservice.com.ua/images/coin-master-free-spins-fb-champion_GM406889139.pdf
    • http://pianoservice.com.ua/images/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdf
    • http://pianoservice.com.ua/images/roblox-skins-boy-free_GM431946152.pdf
    • http://pianoservice.com.ua/images/coin-master-golden-card-hack_GM406889139.pdf
    • http://pianoservice.com.ua/images/roblox-no-download-hack_GM431946152.pdf
    • http://pianoservice.com.ua/images/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://pianoservice.com.ua/images/get-me-free-robux_GM431946152.pdf
    • http://pianoservice.com.ua/images/free-coin-link-for-coin-master_GM406889139.pdf
    • http://pianoservice.com.ua/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://pianoservice.com.ua/images/coin-master-hack-progamers_GM406889139.pdf
    • http://pianoservice.com.ua/images/coin-master-instagram-free-spins_GM406889139.pdf
    • http://pianoservice.com.ua/images/extra-free-spins-for-coin-master_GM406889139.pdf
    • http://pianoservice.com.ua/images/www-free-robux-com_GM431946152.pdf
    • http://pianoservice.com.ua/images/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000484d.bin
46e1c87e2d4d162ed6ae3fb6793499c99ddf3862cae51e65155f3419f0064e5d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x484D 25540 bytes
font_01_sfnt_off0000838d.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x838D 2824 bytes
font_02_sfnt_off00008d36.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D36 5696 bytes
font_03_sfnt_off00009a47.bin
bf685174d95750e966879b9f3e909b67ba6c4a84916aa97962856bc55bc72393
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A47 18412 bytes