Malicious PDF — malware analysis report

Static analysis result for SHA-256 83165f98ea555699…

MALICIOUS

PDF

43.3 KB Created: 2021-06-04 02:21:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0912cbb7f2e569f0ede66c354b2bc64d SHA-1: 44cf040a0bc6076b8429b5273e39cc49080bfe5b SHA-256: 83165f98ea555699b9178af327227cfcdf4ee26b2e72f32afbb1b623d0a28c8b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The embedded URLs, such as 'https://netcdn.online/app/406889139/coin-master-free-redeem-code-game-hack', are designed to lead users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/coin-master-free-redeem-code-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-cheat_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-tiktok-invitation-template_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-spin-and-coin_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_004_off00005009.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5009 24200 bytes
SHA-256: 2e8b571e082cea8c4bd89f2acf6a534f340e0cd75e41df9ad2a30c6d9fc81532
font_01_sfnt_off00008703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8703 18144 bytes
SHA-256: 5bbd7c38c96c77c4f9f35a136dd3471001d40e5cdd485746050297559c8b8e4d

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