Malicious PDF — malware analysis report

Static analysis result for SHA-256 186962831d89a484…

MALICIOUS

PDF

44.8 KB Created: 2021-05-17 04:33:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ec266284798cdb508254641d57d6dd8a SHA-1: 6bd79314422c4cc1c1c75aa81b8d73d6d0712077 SHA-256: 186962831d89a484f71f63b976ddfaf68e16e674c9c37e966a2b50920043dbce
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links that impersonate popular brands like Facebook and Roblox, using lures such as 'game hack' and 'free spins' to entice users. The primary link, https://netcdn.xyz/app/431946152/2021-roblox-game-hack, is associated with a game hack lure and impersonates Facebook. The document body, though heavily obfuscated, contains references to these lures and other URLs hosted on uctaren.eu, suggesting a credential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/431946152/2021-roblox-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/431946152/2021-roblox-game-hack PDF link annotation
    • http://uctaren.eu/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://uctaren.eu/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://uctaren.eu/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/roblox-premium-free_GM431946152.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.

FilenameKindSourceSize
stream_003_off0000467f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x467F 26812 bytes
SHA-256: 58064f4fbacdf08de52a605ed0f9c639060a311be1b80adf3593949e7295dae7
font_01_sfnt_off00008307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8307 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB6 18184 bytes
SHA-256: 056fc97d28377ebe533b38410a286871364a28d37687da14045fa683fef2556f

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