Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c603be2653869b…

MALICIOUS

PDF

47.3 KB Created: 2021-06-04 00:55:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b9f7b19a3ef67d4dda656cfdb259f2d8 SHA-1: 640d9c21c25bb55c18cc5d8d7d61cce112b477bd SHA-256: 64c603be2653869bbe164b9885f5f106ab7b29d02a34fd28246cee230935b6a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game-related lures, indicating an attempt to trick users into visiting malicious websites. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/blox-fun-info-game-hack In PDF document text
    • http://library.futureuniversity.com/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/earnrobux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A3 26808 bytes
SHA-256: 05c612db206ded78ab5dded473480e18765143600735527ace85493932392fc3
font_01_sfnt_off00008da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA0 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9752 17928 bytes
SHA-256: 378f68af7bda96ca08821290e5d02393c78bb3c0fb942949d143c89702000491

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