Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c99de9d0cf987e4…

MALICIOUS

PDF

32.9 KB Created: 2021-06-27 06:17:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e3bff96c6e266f36b09c7c28ab249045 SHA-1: ea875398970d49225d1f99c9dc11c1136622a04e SHA-256: 9c99de9d0cf987e435a5f8adac73c9cb0e2cca38453b774f6d03bfa3ff5f0593
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which are hosted on 'perpustakaan.ipts.ac.id' and masquerade as free game hacks or currency generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of many similar URLs strongly suggest a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/download-roblox-free-mundschutz-game-hack PDF link annotation
    • http://perpustakaan.ipts.ac.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-murder-mystery-2-roblox-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/hacks-para-roblox-robux-gratis-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-items_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-jailbreak-bigger-bag-for-free-script_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/como-hackear-tener-robux-gratis-con-bots_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-black-clover-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/tiktok-free-gas-hack_GM835599320.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-on-macbook-pro-2021-ios_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/why-am-i-a-cheater-in-roblox-parkour_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.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_off00002ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD4 21248 bytes
SHA-256: 75f51309c359044479881fa7541815df52d0d5630de3fc5ec808f9a0e8df04e1
font_01_sfnt_off00005957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5957 19844 bytes
SHA-256: 1be6509c65a0e089ea151e992cecb124aa4b7c7d5aa278f4651cdc4665cce64d

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