Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c4c57779c54d03…

MALICIOUS

PDF

42.9 KB Created: 2021-05-13 03:41:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bdaa9ec41efe58633c80529a9223ef23 SHA-1: 16b99445da0622df4dbe748fc88625360a67ff74 SHA-256: 59c4c57779c54d0326977d07533e82761ac4af5bbfb89b95db2291fc4d8382eb
110 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-optimized PDFs related to game hacks and free currency. The document body, though partially corrupted, contains references to 'Free Robux Generator' and a URL pointing to a similar generator. The presence of a PDF link farm heuristic indicates a deliberate attempt to create a large number of outbound links, likely for SEO manipulation or to direct users to malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via lures for popular games.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/free-robux-generator-for-kids-game-hack PDF link annotation
    • https://www.legclub.org/uploads/files/files/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-without-downloading-apps_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
stream_003_off00004a6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6F 25172 bytes
SHA-256: ad7c2ef56bd82c7fb06bc9347439e6497c9c044e522ef6ad8ceec32e04d1e2a2
font_01_sfnt_off00008421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8421 18640 bytes
SHA-256: 699ebd5d78640cc812bbb586150daa4d415ceda65572c7c56e250d7f18cab54c

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