Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26f8b4406aadeb5…

MALICIOUS

PDF

45.0 KB Created: 2021-06-11 02:58:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 53a48bd85a461b22b65da051c371e8a0 SHA-1: 5ab719fdef8073fb5867ad963deaaf6b7d4edf5e SHA-256: e26f8b4406aadeb5ed928e68f404ee03552abbb8bd6fcef82bfc87c4520c5018
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are related to game hacks and free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm for SEO manipulation or to distribute malicious content. The presence of a 'download button' lure further supports the idea that users are intended to click these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/como-tener-hacks-en-roblox-jailbreak-game-hack
    • https://nhadatinfo.vn/upload/ckimage/files/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/free-roblox-gift-card-codes-2021_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/roblox-admin-hack-code_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/free-robux-generator-no-human-verification_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/is-minecraft-java-edition-free_GM479516143.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/get-free-roblox_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/coin-master-free-spins-save_GM406889139.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/free-robux-without-human-verification_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/can-you-get-robux-for-free_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/roblox-fun-com-robux_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/roblox-help-free-robux_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/free-gfx-maker-roblox_GM431946152.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/free-coin-master-spins_GM406889139.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/coin-master-hack-injection_GM406889139.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/is-minecraft-education-edition-free_GM479516143.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/minecraft-free-computer-game_GM479516143.pdf
    • https://nhadatinfo.vn/upload/ckimage/files/coin-master-free-coins-link-facebook_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005100.bin
16a486d0b40e44965c4d7f51f8cda627af4e0a982742560edc3cfb780939ff9c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5100 26040 bytes
font_01_sfnt_off00008c36.bin
341f56b77901cdbae28747da1ced4615e1ec44f77997c4d2c553eee5ecfa2daf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C36 18728 bytes