Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4677e957d5edaa…

MALICIOUS

PDF

45.6 KB Created: 2021-06-13 17:29:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7518c78459c1b8a458f4dcd450630eed SHA-1: 074072175805ddc4c5f711a9d2088afda038f983 SHA-256: ae4677e957d5edaaadb9e2903a01648461eeff0ca75f1d72796de01cb8957133
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a common lure of 'free Robux' and game hacks to entice users to click on embedded links. The heuristics indicate a link farm and a redirector, suggesting the primary purpose is to drive traffic to potentially malicious sites. The document body contains multiple URLs, including a primary redirector and numerous links to other PDF documents hosted on what appears to be a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 http://netcdn.co/app/431946152/free-robux-hack-july-2021-game-hack PDF link annotation
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id/repository/robux-win_GM431946152.pdfIn PDF document text
    • http://grhasurya-pustaka.smkmuh2wates.sch.id//repository/minecraft-hacks-115-2_GM479516143.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
font_00_sfnt_off00005158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5158 25964 bytes
SHA-256: 046aa44a19ac60fc5a1694c9b166b4834a383f0e7dd27471d7fabd4793601b39
font_01_sfnt_off00008cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFB 19232 bytes
SHA-256: 5b06b295e5e6df8ccd623897deb28e7dd7ca03d8ae81da4e9524d7402edfb3ee

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