Malicious PDF — malware analysis report

Static analysis result for SHA-256 863939d5198b3feb…

MALICIOUS

PDF

43.9 KB Created: 2021-06-04 04:23:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bca718e6bf61f1dedcd977b94d2272ef SHA-1: 0237a6e923f2b7b7638d6575e4a5f20ed441ad6d SHA-256: 863939d5198b3feb7177b761b04f55fbb12de8d53c6a9f753142519889a30ea5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to a known malicious domain, masquerading as a 'free generator' or 'game hack'. The document body, though heavily obfuscated, contains references to 'Free Robux' and 'game hack', reinforcing the lure. The ML classifier also flagged this PDF as malicious.

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/431946152/free-robux-com-2021-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-roblox_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/haktuts-coin-master-free-daily-spins_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_off00004f37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F37 24804 bytes
SHA-256: 94c03980c1e0e155436c3b4d9b2396557872f08da8cb2f0c25a18ec565fd9efa
font_01_sfnt_off000087d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D2 18676 bytes
SHA-256: db7deb15448d884d15c6a42f746ab8a768d26593fd7e085f0109997e06cd96ff

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