Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f36ca59a48ce5f…

MALICIOUS

PDF

35.0 KB Created: 2021-06-30 01:57:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 36e4e88be4b4d4a0609ed8107cf4c54e SHA-1: 853ec36f5edaa455c0733e8127483a8718271c17 SHA-256: b5f36ca59a48ce5f17659b65699907bf5dafb1763ca6e01fe3e8d671861771a5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to lure users with promises of free game currency or hacks. The primary lure observed is for 'Robux' and 'Coin Master' cheats. While no scripts were explicitly extracted, the PDF structure and the nature of the links strongly indicate a phishing or scamming attempt, likely relying on embedded JavaScript or other PDF exploits to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/5-robux-for-free-game-hack PDF link annotation
    • http://stikespantirapih.ac.id/home/repository/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/comment-avoir-cheat-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-no-downloading-and-no-email_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hack-script-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/memcorrupt-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacks-for-falling-that-actually-work-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacked-roblox-items-on-catalog_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-level-7-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hack-site_GM431946152.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_off000031b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B6 22636 bytes
SHA-256: 90cae0d0d92a3e4bf4f01def11c47b552781e112d54ed1bc416d06c356332861
font_01_sfnt_off00006491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 18848 bytes
SHA-256: 165b29d63d6e6b074aea24c5e69a1e6f170b016e6c4fec06f78f701b6bbc5557

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