Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa65fd3990094dc7…

MALICIOUS

PDF

40.8 KB Created: 2021-04-27 06:27:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6a832b8d26f1e6e6556f3805e32e6ca1 SHA-1: 0627da641975de74405b96522dc1d8def7fbf9b2 SHA-256: fa65fd3990094dc778e910e390adecf1202edcebde2f6b8e48f2002d894bd4cb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary focus on 'Robux Hack' lures. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it links to game hack generators. While no scripts were extracted, the document's structure and embedded links suggest it is designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/robux-hack-tampermonkey-game-hack PDF link annotation
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-limitless-free-robux-unpatched.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/roblox-online-free-no-sign-in.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/roblox-insert-tool-hack.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/redeem-roblox-gift-card-free.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/roblox-meep-city-money-hack.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-5-bil-robux.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-free-robux-iphone-5.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/cool-free-halloween-costumes-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/ok-google-how-to-get-free-robux.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-hack-roblox-passwords-2021.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_off00004181.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4181 25992 bytes
SHA-256: 3ad9fa51274d5266ff773ab366ed95e61532dd337b09c89c6709895c5f076015
font_01_sfnt_off00007bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD0 18864 bytes
SHA-256: 64c26bacf6ab6ca1435bee859843ca69f361a7c7a0442ede434d2ebb704d371e

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