Malicious PDF — malware analysis report

Static analysis result for SHA-256 5855feacf9defab4…

MALICIOUS

PDF

36.2 KB Created: 2021-07-05 00:17:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5c5f453a4661ea8d309a414407acd3b5 SHA-1: 5f957ee5da71fc17512ec9878304e123e8f10b4a SHA-256: 5855feacf9defab4ea6e22a4e08e86800d0dc5e15ba2ad7dfaaa739046fb7687
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a lure for game hacks, specifically targeting Coin Master and Roblox. The primary URL, http://netcdn.tw/app/406889139/coin-master-rewards-free-spins-game-hack, is identified as a high-risk redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-rewards-free-spins-game-hack PDF link annotation
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/how-to-get-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/easy-robux-today_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/robux-hack-pro_GM431946152.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning2.man4sukabumi.sch.id/__statics/gudangsoal/files/coin-master-mod-apk-free-download-for-android_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_002_off000036a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36A8 22960 bytes
SHA-256: 72dd964b61cf271d7a206a521b47902dcd70d64bbc756c86890e6fee3b441654
font_01_sfnt_off00006a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A48 18512 bytes
SHA-256: 6bc66a7c9124691c5dbe04e2c8d08202ba1ceeb7f14ff76ef8eff16a4b1fabf8

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