Malicious PDF — malware analysis report

Static analysis result for SHA-256 c535bcd3ef2f73ac…

MALICIOUS

PDF

34.9 KB Created: 2021-06-20 06:41:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 58dc606024e16a94e41657340fd31676 SHA-1: 85334b611c8c66b05279a7a45116ff1e2baee22b SHA-256: c535bcd3ef2f73ac133bfa24e8f6e959d09c4fabd01f3e2032d89a4cf4c082a6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF files, suggesting a link farm designed to attract users searching for game cheats or hacks. The ML classifier strongly indicated maliciousness, and the presence of download-related phrasing further supports a malicious intent to trick users into downloading unwanted or harmful content. The primary IOCs are the URLs pointing to these deceptive resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/roblox-mad-city-cheat-codes-game-hack PDF link annotation
    • https://khavarrooy.com/assets/uploads/pages/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/whats-robux_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/real-robux-generator_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-robux-no-human-verification-and-no-survey_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_off00003119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3119 22104 bytes
SHA-256: 03d5e2bce4aab0ee05462af3be416f8d0519d184a5122a2eb6be10a75b246a02
font_01_sfnt_off00006237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 19424 bytes
SHA-256: a814c4ecd7a09dc86038889bdb3280608d27bde1c208d0f2ea981242362dd8fb