Malicious PDF — malware analysis report

Static analysis result for SHA-256 535105e07ed4eae4…

MALICIOUS

PDF

40.2 KB Created: 2021-04-28 16:39:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fbf45738f6ded8695880a112fffe34d0 SHA-1: c9477e09c01174eb37ff7aa2428809a161613aba SHA-256: 535105e07ed4eae459d9f0ee0f2e31085140b050be86fdeed6c51faae9afed59
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Free Robux' and links to external URLs, one of which is identified as a game hack redirector. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

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/free-robux-xbox-one-2021-game-hack PDF link annotation
    • https://pn-tapaktuan.go.id/pustaka/repository/como-hackear-roblox-robux.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-roblox-limited-items.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-sharingan-free.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/top-12-groups-on-roblox-that-give-free-robux.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-games-where-you-can-get-free-stuff.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/surf-hack-script-roblox.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-get-free-coins-in-phantom-forces-roblox.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/hack-de-roblox.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/hack-skybox-roblox.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/hacks-for-texting-simulator-roblox.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_off000040e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40E5 25552 bytes
SHA-256: 7687c4a889fbc7a7cb9d27743d9a8ea3351fb52706d0ca564030c6914e7b7c0d
font_01_sfnt_off00007b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 18416 bytes
SHA-256: 78ce4d7f3c529c130c539091355346f28572af791ba0b008516c48bdb98989a6

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