Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c90bc6b79f1585…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 21:17:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a4c0fcd41389e8c100c9fceeca882f7b SHA-1: e7c7de01427bbd2daa9888c91c57867a7488c4f5 SHA-256: 82c90bc6b79f158529066b4cbdaa350398df76a3fa83c375c7881ae8e8955470
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are presented as "hack tools" for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a malicious intent to redirect users to potentially harmful content or scams. The ML classifier also strongly flagged this PDF as malicious.

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.tw/app/406889139/coin-master-hack-tool-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-make-everything-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-account-giveaway-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/pain-exist-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-client-for-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-i-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-for-real_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_002_off00002f0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F0D 23356 bytes
SHA-256: f3bedfba362611e6ebf557ccc5bb189d4e99975927581977e0e361e94632263a
font_01_sfnt_off000063f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F7 18080 bytes
SHA-256: d73e4cba5eae4963415d942f6085a7e87ee20f191a57df75a2e3d628f5bdbb21

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