Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eea3f3655dbe4d…

MALICIOUS

PDF

49.2 KB Created: 2021-04-26 03:27:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7e9385b21878d3a2651a4508bcf64685 SHA-1: a6bee6d3683d3fec21579312b3fde6efa30ab345 SHA-256: f4eea3f3655dbe4d7f652f5c932e81d5b29be92fcbb56702a80993b8f18fc89e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites that promise game hacks and free items, specifically related to Roblox. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' confirms this lure technique. The primary IOC is the malicious URL that likely hosts the next stage of the attack, potentially a downloader or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://netcdn.xyz/app/431946152/roblox-free-headphones-game-hack PDF link annotation
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/hack-to-get-the-legendary-pet-in-adopt-me-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/hahow-to-hack-roblox-fly-on-sky-ward.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/hacks-para-counter-blox-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-hack-out-of-bank-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-code-on-how-to-get-clothes-for-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/bux-com-free-robux.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-become-hacker-in-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/simple-roblox-robux-hack.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-help-someone-hacked-me.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-without-verificaton.pdfIn PDF document text
    • https://freerobux.cyouIn 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_off00004097.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4097 29748 bytes
SHA-256: f627601341ba79fbbc4a99acaeee4309555f00af11c7c79a0b1fa4efe550d06d
font_01_sfnt_off00008291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8291 11440 bytes
SHA-256: 154d59d1680f2d1e38ccb783d6997f344290d121007e51df331726de4128c12e
font_02_sfnt_off00009db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB2 18692 bytes
SHA-256: b26cfe066732e6f08ad759826c7c8ea352b1036613aefc64d9fe66773c86d02e

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