Malicious PDF — malware analysis report

Static analysis result for SHA-256 827c91515a29610b…

MALICIOUS

PDF

48.9 KB Created: 2021-06-04 02:33:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8340b7a85ad9849854d438cf0996d783 SHA-1: 8de17be15c8e886135e244b861e9ec4ddaa5d7e7 SHA-256: 827c91515a29610b24eeb811fa32bb90675fbd41a8ba534330bec730f7176010
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and a heuristic firing indicating it's a game hack redirector lure. The document body, though heavily corrupted, contains references to 'Roblox Hack Scripts' and a URL that reinforces this theme. The presence of embedded URLs and the overall structure suggest an attempt to trick the user into downloading a malicious payload or visiting a phishing site. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/roblox-hack-scripts-pastebin-game-hack PDF link annotation
    • http://librarysenior.com/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/pubg-uc-yatr_GM1330123889.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/2021-free-spins-coin-master-link_GM406889139.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_off000053d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D3 25240 bytes
SHA-256: 4245c5c5ed1c4f3b4d0d55bd944a1a546f1e20b0c00ce6100702868537f9a8d5
font_01_sfnt_off00008e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E78 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B20 18736 bytes
SHA-256: ab18ebd86474bf723d827c8d503b9efdd759369ebb4bbf8c3e0b4762acc2a078

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