Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba757a37d6c89492…

MALICIOUS

PDF

41.8 KB Created: 2021-04-29 06:15:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: db2cc9e511e3b50899127f02b169e0ba SHA-1: 57e00ee67a6880ddf6d2712d346316f3edd767b8 SHA-256: ba757a37d6c89492ea159ed46a175b6011ca52fa17b09934746ea699faff03fb
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure related to 'free Robux' and impersonates Facebook to trick users into clicking a link. The primary link, https://netcdn.xyz/app/431946152/how-to-get-free-robux-ipad-only-2021-game-hack, is associated with a game hack redirector and brand impersonation for credential phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow designed to lead the user to a compromised site.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/how-to-get-free-robux-ipad-only-2021-game-hack.
  • 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/how-to-get-free-robux-ipad-only-2021-game-hack PDF link annotation
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-no-virus-hax-free.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/f3x-tools-hack-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-de-jailbreak-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-hack-pc-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/crimson-roblox-hack.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/how-to-get-free-robux-without-a-human-verification.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-how-to-get-free-hats.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/get-a-free-promo-codes-for-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-on-ipad-pro.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-edit-money-value-cheat-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_off0000412e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x412E 26532 bytes
SHA-256: 5482a1a291d16981f0f8d9b8fe7aeca9f3fdf55f4c4e230b2e36a40db7779e0a
font_01_sfnt_off00007d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D85 19516 bytes
SHA-256: 0ac84b54b18b427bbeb7228efc5dc34485d95abe93007f6e80880af0fb523535

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