Malicious PDF — malware analysis report

Static analysis result for SHA-256 518293b6a2ea6bca…

MALICIOUS

PDF

42.4 KB Created: 2021-04-29 03:56:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 184b731b4f6613a0a8dd2ccc05912715 SHA-1: 6451e852a432cad45369f8d86e7395d199557ddb SHA-256: 518293b6a2ea6bcac2343565ee085226ff2be11905177d540d70a97bb1b611fc
90 Risk Score

Malware Insights

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

The PDF document contains multiple links and explicit calls to action, such as 'CLICK HERE TO ACCESS ROBLOX GENERATOR', designed to trick users into downloading or visiting malicious sites. The primary lure is related to game hacks for Roblox, a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the presence of numerous suspicious URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-pet-simulator-hack-2021-game-hack PDF link annotation
    • https://coffeesur.com/ckfinder/userfiles/files/hack-dragon-ball-rage-for-roblox-danload.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/roblox-hack-2021-no-survey.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/roblox-snow-shoveling-simulator-free-santa-bag-ijf.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/how-to-get-free-robux-and-save-it.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/how-to-get-anything-on-roblox-for-free-wikihow.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/roblox-reach-hack.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/https-www-roblox-com-games-2021202123-free-admin.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/free-roblox-headphone.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/how-to-get-free-robux-no-hack-or-cheat-2021.pdfIn PDF document text
    • https://coffeesur.com/ckfinder/userfiles/files/free-girl-roblox-accounts.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004431.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4431 26500 bytes
SHA-256: 33e7199200252f86f08b5d9334fe99876f3a5957378bc321bd9eb3891f438a18
font_01_sfnt_off000080e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E6 19364 bytes
SHA-256: 631529b8c66e2dd8f849a61bc5c0af6edc95d402a01e3bfaa27adf8816781c74

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