PDF malware analysis — malicious · e853789f1bada799

MALICIOUS

PDF

44.4 KB Created: 2021-04-27 14:13:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 5e9e774542908b670bd5c779aaad3c63 SHA-1: 48575852d4471140a08afe9987906471ae13b8ae SHA-256: e853789f1bada799a1b4f4f10dc078c5b58f16a18d9f9d362e980a95d97cd925

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple invisible links and a visible call-to-action lure, all pointing to a URL promising free Robux and a game hack. This is a common lure for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used for the malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9868

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.
Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE

PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
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
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-generator-recaptcha-game-hack In PDF document text
- http://www.saburai.ac.id/elibrary//repository/free-robux-codes-2021-pastebin.pdfIn PDF document text
- http://www.saburai.ac.id/elibrary//repository/how-to-make-a-roblox-hack-using-hxd.pdfIn PDF document text
- http://www.saburai.ac.id/elibrary//repository/free-robux-hack-no-verification.pdfIn PDF document text
- http://www.saburai.ac.id/elibrary//repository/hacks-to-get-free-robux-2021.pdfIn PDF document text
- http://www.saburai.ac.id/elibrary//repository/roblox-login-free-account.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/free-robux-promo-codes-september-2021.pdfIn PDF document text
- http://www.saburai.ac.id/elibrary//repository/free-robux-working.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/free-pins-for-roblox.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.

Filename	Kind	Source	Size
`stream_003_off0000416d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x416D	26240 bytes
SHA-256: `eb5c15da9c6d816a13ba61db21d45130340ee84683e0f9112969b399999ea1ad`
`font_01_sfnt_off00007d5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7D5D	3952 bytes
SHA-256: `4da923461e38ced4c87a348ff1a09fe7faac33a2fdaa7b3d61edca3d1e321187`
`font_02_sfnt_off00008a4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A4C	18688 bytes
SHA-256: `b3fcb02d0e10a9fad27d5dc01560e317d261a41fdef73babfb6a747bd1eaa271`

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