Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52cef0d72c44bde…

MALICIOUS

PDF

47.4 KB Created: 2021-05-17 21:55:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6e40684bfc1f3d15754a2ede6fa1daf5 SHA-1: 4aaca6840d772e81d4d381831d2b0d7714bb5ddf SHA-256: b52cef0d72c44bde18cd70b065a6ceb66958661e7b6312f0ffdcf9c6162daf12
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-farmed to appear as legitimate resources for in-game items like Robux and Coin Master spins. The primary URL, https://netcdn.xyz/app/431946152/get-more-robux-game-hack, suggests a lure for obtaining virtual currency. The heuristic PDF_SEO_LINK_FARM indicates a large number of such links, reinforcing the scam-like nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/get-more-robux-game-hack PDF link annotation
    • http://www.bripi.pl/images/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-obby_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
stream_003_off00004c6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C6D 26660 bytes
SHA-256: 2bb4d2993c16e50da5fbc6e4d90a5128467ffef8a61a120dd3a44ea2f9d26371
font_01_sfnt_off00008a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A85 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000972c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x972C 18152 bytes
SHA-256: 3f0afb5031a6524980f5b4f14d61315d560e84a079a8a334c40e6e2be07f7597

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