Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb3c251461643cb…

MALICIOUS

PDF

41.6 KB Created: 2021-05-15 00:36:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d8ea8a98dfe5eb41dab6cc5c9e0b963e SHA-1: 65759a3d4a1c7d62adfe7cb4524abea8156ec858 SHA-256: 2bb3c251461643cb15d0aae9d9e2bc3f6a279dcb1b506ffb125135f5f4916d83
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, identified as a PDF link farm. The primary URL and many others point to resources related to free spins, game hacks, and robux, suggesting a lure for users interested in such topics. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a 'download button' heuristic further supports the malicious intent. The file likely serves to redirect users to potentially malicious or scam-related content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/50-free-spins-coin-master-links-game-hack
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/robux-free-gift-card_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-latest-mod-apk-free-download_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-com_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-links-2021_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-robux-hack-us_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-roblox-hair-girl_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-in-app-purchases_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/roblox-images_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/roblox-free-models_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000483d.bin
d6b98b6e99693c3ffabe136851ac961ca976ba41f3b02549d33850481beb9b7a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x483D 25076 bytes
font_01_sfnt_off0000800e.bin
5f18526dee368ac18b20cf023ba1ff49340788242d54a3837ea53eed50d07245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800E 18364 bytes

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