Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8e3f4c933eb829…

MALICIOUS

PDF

35.8 KB Created: 2021-06-21 18:01:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 470fc69a6fd95c485d8fb93852b7230b SHA-1: 5556d66f0a2a635c493bfe476a90dc219dff5c53 SHA-256: 8d8e3f4c933eb8294d4152fb3c78b68433ed92070b8a1203817fe1b2e911b21f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, forming a link farm, with titles suggesting game hacks and cheats. The primary URL http://netcdn.co/app/431946152/esp-roblox-hack-game-hack likely serves as a lure for downloading malicious content. The presence of a PDF_SEO_LINK_FARM heuristic firing and the ML_NYX_PDF_MALICIOUS score strongly indicate malicious intent, likely to trick users into downloading malware disguised as game cheats.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.co/app/431946152/esp-roblox-hack-game-hack PDF link annotation
    • http://amcoeur.org/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/actual-free-robux-noothing-reques_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/hacks-para-pixel-gun-roblox_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://amcoeur.org/images/how-do-i-hack-steam-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://amcoeur.org/images/cheat-central-roblox_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/does-the-roblox-hack-work_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://amcoeur.org/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/top-10-los-mejores-no-hack-de-roblox_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://amcoeur.org/images/pagina-de-hack-de-roblox_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://amcoeur.org/images/roblox-treasure-hunt-simulator-coin-hack_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
font_00_sfnt_off000033f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F8 22936 bytes
SHA-256: 91631b7e9008ec6c23851f0d63b1e3bb841c2206d4e19b8f6b16e6b5e3a624c4
font_01_sfnt_off00006750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6750 18832 bytes
SHA-256: 410a0c7d9de9a25b6b572978beade7ea2a53349a753e9773195f30ba3f4ca1d3

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