Malicious PDF — malware analysis report

Static analysis result for SHA-256 823a4f08dc1bcdb9…

MALICIOUS

PDF

36.1 KB Created: 2021-07-19 19:22:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 817a7c0012b4bf15b0540fddbfa1b6ae SHA-1: aac9e5127e34b67e75e0294abc3b1a955da2b002 SHA-256: 823a4f08dc1bcdb9417eab6e07b9b2b1d0d1bbca18f6cc9841a4b499df6a93f8
82 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 free rewards, directing users to a malicious URL. The ML classifier strongly indicates maliciousness, and the embedded URLs are associated with such lures. The document's purpose appears to be to trick users into visiting a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-today-gift-reward-game-hack PDF link annotation
    • https://alexandergroep.nl/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://alexandergroep.nl/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://alexandergroep.nl/images/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • https://alexandergroep.nl/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://alexandergroep.nl/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://alexandergroep.nl/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://alexandergroep.nl/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://alexandergroep.nl/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://alexandergroep.nl/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://alexandergroep.nl/images/coin-master-free-spin-and-coin_GM406889139.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_002_off00002ee6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EE6 26092 bytes
SHA-256: ac39d1970bc8bc2fa018d55265f840fb89233264ce6ee7d58cdefdf09d24a445
font_01_sfnt_off00006ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC3 18404 bytes
SHA-256: 20323906fae34ef48fb3028b175607ed26afea8233a7a83525bcd6516f32abbb

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