Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebda7ca08676878a…

MALICIOUS

PDF

44.2 KB Created: 2021-04-23 20:29:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ada4c7fad7ed2901e8e5d88bbb2b419d SHA-1: ebde44f5fb5bd7a3ea44e331881d195d67757325 SHA-256: ebda7ca08676878a1ca8ac2f2b60cc02a176d45d724d642fb93f9e1265978361
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9868

Heuristics 4

  • 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://netsecure.top/app/431946152/how-to-hack-other-roblox-accounts-2021-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/earn-free-robux-website.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-cheats-for-tix-2021.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-roblox-troll-gui-synapse.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-how-to-get-free-robux-june-2021.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-cheat-in-roblox-games-defenders-of-roblox.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-roblox-pastebin.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/robux-bandit-free-robux.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/bloxburg-roblox-hack-2021.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-everything-in-roblox.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-jailbreak-money-hack-no-human-verification.pdfIn 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_003_off000040d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40D4 26980 bytes
SHA-256: 7f669da751fc566dbf13e639a423640ee22d05dc385ed34f3ce7f4592366df29
font_01_sfnt_off00007dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDA 2896 bytes
SHA-256: a9734f601ab51531ddc627968baf99e061fe05a52d08fb24eabe5a53f69c0820
font_02_sfnt_off000087da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DA 19156 bytes
SHA-256: 753834af926f5dcf8e7b808ec2ae2c77f0449cf360c679947602674d8da4570a

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