Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0774985e6c6d72…

MALICIOUS

PDF

50.0 KB Created: 2021-06-04 00:25:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: da90becc3abb76611a40e9915c1abccb SHA-1: 3de37b34ebedc824f3a9d23e345f338a64b65ca8 SHA-256: bb0774985e6c6d72dcf8ab1f91514def191d7d26f4b94f804ba4b31b4fdf071d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are disguised as game hack generators or free currency resources. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, but the document body and heuristics point to a lure for users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/easy-robux-hack-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-tiktok-likes-no-verification_GM835599320.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free_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_off00004ffc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FFC 30820 bytes
SHA-256: 8d01aa1ba086dfbeea235592caa0b1963fc24fc88ac81fcc38ff24970234ed24
font_01_sfnt_off00009668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9668 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000a052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA052 18428 bytes
SHA-256: 2bceebe5c1993dbcd4316f947943b347169ed843d74f7d3766fe916d90107923

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