Malicious PDF — malware analysis report

Static analysis result for SHA-256 399c8cb5555b4499…

MALICIOUS

PDF

44.4 KB Created: 2021-05-12 18:13:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5f8ed1697609a85a96209ecb26da93f3 SHA-1: 313b36a5bc0c1520fc942bdbb964a22439374b5d SHA-256: 399c8cb5555b449984219c21857309792abbc370384fc5c064b7547a06556457
200 Risk Score

Malware Insights

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

This PDF document impersonates Microsoft to lure users with a "game hack" or "rewards generator" offer. It contains a link to a malicious redirector, https://netcdn.xyz/app/431946152/microsoft-roblox-rewards-game-hack, which likely leads to further malicious content or malware download. The document's structure and embedded links suggest it is designed to exploit user interest in free in-game items or currency, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/microsoft-roblox-rewards-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
  • 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/microsoft-roblox-rewards-game-hack In PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/androeed-ru-minecraft_GM479516143.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_off00004c95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C95 26468 bytes
SHA-256: 9e66dcff7bbccd5d5f0ba7ff721b4e3b4100947c7a00afd16c320eb4cd9e7555
font_01_sfnt_off000089cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CF 18772 bytes
SHA-256: 885cbd3f72e53b67117bb4048e91371d45fd893deaab7f6141eb78c54bb681fd

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