Malicious PDF — malware analysis report

Static analysis result for SHA-256 a628c9e910b9a9a4…

MALICIOUS

PDF

48.2 KB Created: 2021-06-09 04:14:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0a8f211dc5e244559a53fcf3ad4a77f1 SHA-1: ee4557eb079a5f1815386faf3a5233296bce9cc8 SHA-256: a628c9e910b9a9a4517bcddaa991052698bc111548ba84e71834ef09d51b0e45
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are structured as SEO-optimized PDF links, suggesting a link farm or redirection scheme. The document body and extracted URLs indicate a lure for 'Free Robux' and game-related cheats, likely to direct users to malicious content or phishing sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-no-human-verification-100-real-game-hack
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-play-as-guest-free_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-legit_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-roblox-items-codes_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-game-pack-coin-master_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-game-hack-version-download_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-roblox-clothes-girl_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-without-offers_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-coin-master-spin-daily-link_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-version-2021_GM406889139.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-app-real_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/can-you-get-robux-for-free_GM431946152.pdf
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/2021-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053b7.bin
d8141c1aa0592c7754fa6017145fdf7988ff287512501d7a1e077edba0b0d0ab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B7 24816 bytes
font_01_sfnt_off00008d4e.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4E 2824 bytes
font_02_sfnt_off000096fd.bin
208391bf2618c700809d401a060e6a0512eb92f425f213a063b4e4b959501716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96FD 19212 bytes

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