Malicious PDF — malware analysis report

Static analysis result for SHA-256 24eaa2a13492ee9f…

MALICIOUS

PDF

43.4 KB Created: 2021-06-03 06:36:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6da575e3f300396e4ef20abf8d16a063 SHA-1: 9dbc25746e7c46ca3e430fcdd3382c1cb6ffbacd SHA-256: 24eaa2a13492ee9f79c2772a20b19dcdfe0c5e35aa807b632c277239800706ce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as generators for popular games. The document body and embedded URLs suggest a lure for free in-game currency or hacks, which is a common social engineering tactic. The heuristic firings confirm the malicious nature of the links and the overall document.

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/free-coin-and-spin-for-coin-master-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-roblox-premium-for-free-2021_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_004_off000050c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C2 24052 bytes
SHA-256: 5b33b557e417789a5eb1b5ce0230dd87e0c457c4822dd4443cd59ec3da76f69b
font_01_sfnt_off000087c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C4 18060 bytes
SHA-256: 42d2e7759bfcfecd447a46542d8809f4e944f7c9df23d0847fbb4c7837fae2b0

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