Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d00413ea05a1f1…

MALICIOUS

PDF

43.0 KB Created: 2021-04-28 22:52:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 75c8215099b33a940ee65099e42c3cdb SHA-1: 129d59cc8886f8a6e609e862cd9fb84217bc1cc6 SHA-256: c8d00413ea05a1f18691f5b753bc5b1f55894d13500b45472f44eacba8912e1f
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/free-robux-hack-2021-no-human-verification-no-download-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/free-robux-hack-2021-no-human-verification-no-download-game-hack PDF link annotation
    • https://slims.bakrie.ac.id/textbook/repository/robux-plus-hack.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-tbc-on-roblox-2021.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/hacks-para-roblox-phantom-forces-2021.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-theme-park-tycoon-2-money-cheat.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/exploiteur-de-hack-roblox-lumber-tycoon-2.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-giftcard-wix.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/bad-business-roblox-cheats.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-admin-codes.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/hackear-cuenta-de-roblox-2021.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-into-your-roblox-accout-witout-the-password.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_off000043f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43F1 27104 bytes
SHA-256: 1949145192eb240f25fd283125d98475b5a2a8f18ace5771338ce9b2c827c6a7
font_01_sfnt_off0000812c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812C 20012 bytes
SHA-256: a96847a9ba59ea76b13ba6b7e0f6754bc83f610a68e1a819f0f0cf7624a4029d

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