Malicious PDF — malware analysis report

Static analysis result for SHA-256 641d6557473dc6a7…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 23:34:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cdf32aa170e04a1c6e0e759c9b5d1771 SHA-1: dabbec50c1584d01cedad3fd6ae43dd6f95d0e4b SHA-256: 641d6557473dc6a7cb537799501447168ac27af8df28bc3d27aee502fea2eda2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.online/app/406889139/25-free-spins-coin-master-game-hack PDF link annotation
    • http://lib.kunci.or.id/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-svg-free_GM479516143.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_004_off00004f95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F95 24172 bytes
SHA-256: fd0ca85796c0def2a5f6c13d6a2703758518360356b85de2d52c2699839c48f7
font_01_sfnt_off000086e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E0 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000090ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90CA 18144 bytes
SHA-256: e61324631e03e98c071e12442239b73d0a12fcb8243797d210d051c8d69b565d

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