Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3ac77632c82912…

MALICIOUS

PDF

44.2 KB Created: 2021-05-16 12:39:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8eaa1a0be06a79ebc46adf4780ea8908 SHA-1: 81d13d8c50c082821a0d744bb4966404d7d5469c SHA-256: ed3ac77632c829125911d83d112463e9eb97c927ea76aa435b2806cf74261336
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are disguised as related to "Roblox" and "Coin Master" promotions, but impersonate "PayPal" and host content on unrelated domains. The ML classifier and link farm heuristic strongly indicate malicious intent, likely to trick users into downloading malware or divulging credentials. No scripts were extracted, but the PDF structure and embedded links suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-promo-codes-free-robux-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/roblox-promo-codes-free-robux-game-hack PDF link annotation
    • http://bijbelreizenisrael.nl/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://bijbelreizenisrael.nl/images/can-you-get-free-robux-on-roblox_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_off0000481b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481B 27944 bytes
SHA-256: 879a619c5142a9d47daca8dcc97e678b8b1857ab5b0dce60b0180e3a8873e243
font_01_sfnt_off000089a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A2 18676 bytes
SHA-256: 3ed324e585500d41944ebd93500991c566830021fec9c5a8323b790459c3443f

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