Malicious PDF — malware analysis report

Static analysis result for SHA-256 815bc810949f4c2a…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 21:43:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7c3b4bdfc212b189431166667e6bf282 SHA-1: aa7f18770265f2057104f7bb2597e63e1e8e41f8 SHA-256: 815bc810949f4c2acc10d58a89f7a83e07df681fd1fb2609634a95a18e24d4d7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering game hacks and cheats. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests a link farm or redirection scheme designed to lead users to potentially harmful websites. The document body, though partially corrupted, contains references to game hacks and a URL that likely serves as a landing page for a malicious payload.

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/daily-spins-coin-master-game-hack
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-org_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-robux-gift-card-codes-march-2021_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-spin-and-coin-blogspot-com_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-cheat-engine-dragon-ball-rage_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-jailbreak-speed-hack-2021_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-robux-com-real_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/oprewards-free-robux_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-games-for-free-no-sign-up_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-robux-card-codes_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-dragon-ball-rage-stats-hack-site-v3rmillionnet_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/coin-master-2021-free-spins-link-2021_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/go-to-robuxhackpro_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-cards-link-2021_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/today-coin-master-spin-free_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/hacks-and-cheats-for-coin-master_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-guess-that-character-free-robux_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/coin-master-spin-hack-app_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000320b.bin
c745b3c189e24c16173519356a554d17b377c74fa1d43261db1cb451fce968d6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320B 22976 bytes
font_01_sfnt_off000065b3.bin
5c160bbb63ca895ebad240cbc0f13988c031acd4b50862692447457c542b615e
pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 18432 bytes