Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6882bc52b1bed35…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 11:58:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 71812ceda3dcb2ba06e7eb863cf442f2 SHA-1: a4d531d90f0e68a83e6676b1bc6de81344442fbe SHA-256: f6882bc52b1bed35e8482fe28c9477298f981a43f18ddca2a65c9d3424ea9fac
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as a "link farm" pointing to other PDF documents. The document body and heuristics suggest a lure related to "no Robux" or "game hacks", indicating a potential phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.online/app/431946152/no-robux-game-hack
    • https://ifef.es/ckfinder/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-wurst_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-gift-card-online-free_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-games-download-free_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-zone-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/hack-coin-master-spin_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-no-verification_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/get-free-spins-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-come_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-spins-coin-master-twitter_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-minecraft-games-for-kids_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/claim-free-robux-button_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-instagram-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005229.bin
dce72d2d0dab33e7d085c05a79d9a0c0c83d37dcec860c57b30235478ba30f4a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5229 32844 bytes
font_01_sfnt_off00009b70.bin
096069712db6b5d6732bcb1e197377aec390e00cd57ea8fb2786eb315a05e75d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B70 17852 bytes