Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca86f4e828f5ba3…

MALICIOUS

PDF

42.3 KB Created: 2021-05-17 14:01:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9da435978d4b2a941b604d533c4087a5 SHA-1: db9bd042347beab8c534273d1d3167816bc84696 SHA-256: 3ca86f4e828f5ba33a7fd6c2299aa52cc244a14368d096247ffbdc1b19c821f4
122 Risk Score

Malware Insights

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

The PDF document contains lures for game hacks and impersonates brands like Microsoft to trick users into clicking malicious links. The primary link identified, https://netcdn.xyz/app/431946152/best-roblox-hacks-game-hack, is associated with a high-risk redirector. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a potential for client-side exploitation or redirection to a malicious site, likely initiated via a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/best-roblox-hacks-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/best-roblox-hacks-game-hack PDF link annotation
    • http://wwic.wales/uploads/files/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/robux-redeem_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/master-free-spin_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/oprewards-points-generator_GM431946152.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_off00004979.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4979 24776 bytes
SHA-256: fdeb8f0f9bc226fb0ec76735a8a60dbbe3fdca779a213d1054b9a4f391417c1d
font_01_sfnt_off0000828c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828C 18284 bytes
SHA-256: 94dd9c95e592a650c73b90ca092c2767a8462919e19feedd0474aea1e75e19d3

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