Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9eafc99a2f22353…

MALICIOUS

PDF

47.3 KB Created: 2021-06-09 03:52:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 028f841e3f41057c8eff29b817133a6b SHA-1: ad54b8cfbc46075598019ee4e8d3abacb681e48e SHA-256: d9eafc99a2f223536dcbff92c3d8dfeb0d6cee36f90985bbbbdbd2a535ef395d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or content-scraping operation. The presence of a 'download button' lure and the ML classifier's high confidence score suggest malicious intent, likely for distributing further malware or engaging in phishing. No scripts were extracted, but the document structure and embedded URLs point towards a deceptive download or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/best-free-vip-server-game-roblox-game-hack
    • https://tanahlot.id/assets/CKImages/files/roblox-how-to-cheat-on-tycoon-games_GM431946152.pdf
    • https://tanahlot.id/assets/CKImages/files/how-to-get-a-lot-of-robux_GM431946152.pdf
    • https://tanahlot.id/assets/CKImages/files/free-robux-stream_GM431946152.pdf
    • https://tanahlot.id/assets/CKImages/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/coin-master-free-spins-fb_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/free-robux-no-human-verification-generator_GM431946152.pdf
    • https://tanahlot.id/assets/CKImages/files/free-robux-games-that-actually-work_GM431946152.pdf
    • https://tanahlot.id/assets/CKImages/files/free-coin-master-spins-for-today_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/coin-master-free-spins-for-today_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/free-robux-promo-codes-2021_GM431946152.pdf
    • https://tanahlot.id/assets/CKImages/files/free-robux-codes-no-verification_GM431946152.pdf
    • https://tanahlot.id/assets/CKImages/files/coin-master-gameplay_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/free-coin-master-coins_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/best-free-minecraft-server-hosting_GM479516143.pdf
    • https://tanahlot.id/assets/CKImages/files/coin-master-free-rewards-link_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/pokemon-go-free-remote-raid-pass-2021_GM1094591345.pdf
    • https://tanahlot.id/assets/CKImages/files/minecraft-switch-free_GM479516143.pdf
    • https://tanahlot.id/assets/CKImages/files/coin-master-free-rare-cards_GM406889139.pdf
    • https://tanahlot.id/assets/CKImages/files/free-robux-safe_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054e9.bin
218bb2a14b7e5ecb84e2c262bd452dce47e7cdd9183a1ab4175549cbabbeb3ea
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54E9 27876 bytes
font_01_sfnt_off00009429.bin
993f55f741ef7961a1a897d2ebf71d2677a6d60533dc3f28491bc2e29f15c2f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9429 19084 bytes