Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5be8d5ddab1f3e7…

MALICIOUS

PDF

54.0 KB Created: 2021-06-02 19:33:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b20742cadd197478da4389fb90b2a07d SHA-1: af3bd7688809928cb32ee2c83895b8a9d96bc5c0 SHA-256: d5be8d5ddab1f3e7ffa99dce78eb5f65bbaba0892b36e94721c0d3bc4ab017f6
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.xyz/app/431946152/roblox-password-hacker-generator-game-hack PDF link annotation
    • http://shiny-nn.ru/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://shiny-nn.ru/images/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://shiny-nn.ru/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/tiktok-free-quotes_GM835599320.pdfIn PDF document text
    • http://shiny-nn.ru/images/mcpe-com_GM479516143.pdfIn PDF document text
    • http://shiny-nn.ru/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://shiny-nn.ru/images/free-admin-codes-2021-roblox_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/free-roblox-to-play-right-now_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://shiny-nn.ru/images/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://shiny-nn.ru/images/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://shiny-nn.ru/images/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://shiny-nn.ru/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://shiny-nn.ru/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/noclip-roblox-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://shiny-nn.ru/images/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://collectrobux.coIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F0D 38960 bytes
SHA-256: f3c920f6748d5e5799d01a12de5e9effc3bd99cee71c68158ecc8e67683d3f9c
font_01_sfnt_off0000a241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA241 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000af53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF53 18780 bytes
SHA-256: e18bf9207afa11cbb5f7fbfbfa1ddc671ab5bae319713abf5955bc6a4b2cdfd1

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