Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b885209c58b402…

MALICIOUS

PDF

46.0 KB Created: 2021-06-04 02:55:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e1c456ded136cfd4139d1e571c304af3 SHA-1: b40b139974f15f4cf30fcb7018e2de587b422897 SHA-256: 27b885209c58b402dbe7104dd8038204e3cb61f2ddcb1f3889af9f6ed27f7d3b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appears to be a "free generator / game hack". The primary link, https://netcdn.online/app/431946152/free-robux-android-game-hack, is identified as a malicious redirector. The document body and embedded URLs suggest a phishing attempt related to in-game currency or hacks. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/free-robux-android-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/tiktok-accounts-for-free_GM835599320.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/robux-page_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-spins-from-coin-master_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_off00005028.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5028 29784 bytes
SHA-256: 403eefe600471c880702aea7487bd6c8655e3a18c96a63d1e30ab832631885f2
font_01_sfnt_off00009146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9146 18308 bytes
SHA-256: 3d682ae06d788585f0d48ef4471ddbfed33e391fd6a867cb0ce2fb595824b3ec

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