Malicious PDF — malware analysis report

Static analysis result for SHA-256 4834cb53a0a09340…

MALICIOUS

PDF

44.6 KB Created: 2021-04-27 16:37:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e26e6e180622d6514808ebc51c6e77e2 SHA-1: 27d2496478a8bb1cacb53b80ac213297f89fd5a4 SHA-256: 4834cb53a0a093402893df0a3596660d2dcff7caeb61b1d91af7220156eee7f5
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Hack Accounts Roblox 2021' and directs users to a suspicious URL. It also includes an instruction to disable security software, indicating a malicious intent to bypass defenses. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/hack-accounts-roblox-2021-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/free-robux-codes-2021-pastebin.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/best-anime-roblox-t-shirt-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-redeem-toy-codes-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/robux-earn-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/what-does-ce-stand-for-the-hack-for-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/comment-utiliser-les-cheat-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-r-free-robux-robux-robux-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/break-free-song-id-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-hacking-lua-c-script.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-dance-hack.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_off000042a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42A3 25848 bytes
SHA-256: 1ce67d8351fb5a1acbbcb22f8e08cf9587414f422032c39344abf4fa39d152a6
font_01_sfnt_off00007dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD2 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7A 18828 bytes
SHA-256: bf44e3bfe3990babc1484db4cc77d53224653fed98854a446fd480fcfccaf19f

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