Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa055d67a8fee43…

MALICIOUS

PDF

44.8 KB Created: 2021-05-15 11:36:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 34d4ea8486a43c9df7d595ca579ad8bc SHA-1: 00b0d98cb64a96252d1272e0f1acd2e0e21f1b65 SHA-256: 1aa055d67a8fee43fb0a6f1a9f2acdb90b6fde919bfa2cdffd0aef622cfd397e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to appear as SEO-optimized content for popular games like Roblox and Minecraft. The primary URL, https://netcdn.xyz/app/431946152/roblox-free-robux-game-hack, suggests a lure for free in-game currency, a common phishing tactic. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/431946152/roblox-free-robux-game-hack PDF link annotation
    • http://ansacare.com/images/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/roblox-hack-download_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
font_00_sfnt_off000044ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44CE 26508 bytes
SHA-256: 5a394a9bbbebfa06b5a1173b2e628c134a1d7f150ef56ac8abb5ba1fcb826aa4
font_01_sfnt_off0000805a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805A 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D02 18088 bytes
SHA-256: 03c92d59c548fbfdae08874221752d30f8caaed88781636bf7d18542e7c5fe52

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