Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a0d9c08b3d9894…

MALICIOUS

PDF

46.3 KB Created: 2021-06-08 22:43:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 49513bef8e36944a24152b2bc6fecf6e SHA-1: 291aa8a478226d6a695ecdf110f700dfbb144bb5 SHA-256: 79a0d9c08b3d98940dfc6e584d1e4f8ba80c60b7203a33bef10131fc104718f4
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to game-related cheats and free currency generators. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the malicious intent. The document likely serves as a lure to direct users to potentially malicious websites or download further malware.

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/how-to-hack-roblox-top-model-2021-game-hack
    • https://admin.9credit.vn/data/files/robux-withdraw_GM431946152.pdf
    • https://admin.9credit.vn/data/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://admin.9credit.vn/data/files/free-roblox-adopt-me-accounts_GM431946152.pdf
    • https://admin.9credit.vn/data/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • https://admin.9credit.vn/data/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • https://admin.9credit.vn/data/files/cm-free-spin-link-today_GM406889139.pdf
    • https://admin.9credit.vn/data/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdf
    • https://admin.9credit.vn/data/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdf
    • https://admin.9credit.vn/data/files/coin-master-hack-apk-35-11_GM406889139.pdf
    • https://admin.9credit.vn/data/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • https://admin.9credit.vn/data/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://admin.9credit.vn/data/files/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • https://admin.9credit.vn/data/files/coin-master-spins-hack_GM406889139.pdf
    • https://admin.9credit.vn/data/files/www-roblox-com-free-robux_GM431946152.pdf
    • https://admin.9credit.vn/data/files/roblox-avatar-maker-free_GM431946152.pdf
    • https://admin.9credit.vn/data/files/wurst-client-18-9_GM479516143.pdf
    • https://admin.9credit.vn/data/files/free-multiplayer-minecraft-server_GM479516143.pdf
    • https://admin.9credit.vn/data/files/roblox-hack-generator-robux-gratuit_GM431946152.pdf
    • https://admin.9credit.vn/data/files/robux-premium_GM431946152.pdf
    • https://admin.9credit.vn/data/files/robux-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052d8.bin
089b15a6fa15224568a3dd12a3fb9c5ec557c879314730fd75ab5446f2ce367f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D8 26924 bytes
font_01_sfnt_off00008f2f.bin
54711be191defde6e41a57418114ba2f643ea0e3c02e182cd6df3df48583f9b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 19292 bytes