Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc5dd87f05f30f5…

MALICIOUS

PDF

41.9 KB Created: 2021-05-13 15:17:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e54c90627b900aa94a9e53533c2ace23 SHA-1: 66e0baf03ee5365011d8b3f51e63dfba043c2db5 SHA-256: 4dc5dd87f05f30f57ef64ddfb019801269b41a452a6fab0032d824524cdd98c1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to SEO spam pages, indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://netcdn.xyz/app/479516143/how-to-make-a-minecraft-java-server-for-free-game-hack, suggests a lure related to free game servers. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and link farm indicate a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/how-to-make-a-minecraft-java-server-for-free-game-hack PDF link annotation
    • http://reclaimcottage.co.uk/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/infinite-robux_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/free-coin-app_GM406889139.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://reclaimcottage.co.uk/images/coin-master-hack-for-ios_GM406889139.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_off00004af6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF6 23920 bytes
SHA-256: 2c2b32d3e576c70de5eca2df842add9f552c14198860493cd98c306987d1230e
font_01_sfnt_off00008129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8129 18324 bytes
SHA-256: 8dc142bc7e6132cc43f81519c448dbddadbc7e5fdd921c0c5040c748722dd43f

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