Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f153959eea3e9b…

MALICIOUS

PDF

49.5 KB Created: 2021-06-11 03:37:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a410c229499ccbf597b81dc96bc71a4f SHA-1: 98a665485bc13ec5c408417f7f2a64d66dab8546 SHA-256: 89f153959eea3e9b5c07863a990a9b76266ee33528c39b383a06653b53c54387
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm or content aggregation tactic. The primary URL and many embedded links point to sites offering "free Robux" or game-related cheats, indicating a lure for potentially malicious content or scams. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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.
  • 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.tw/app/431946152/free-robux-disney-quiz-game-hack
    • http://perpustakaan.ipts.ac.id/repository/work-in-a-pizza-place-roblox-swim-cheats_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-uc-and-bp-in-pubg_GM1330123889.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-do-you-get-free-roebucks_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/roblox-hack-generte-202199-robux_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/v3rmillion-hacks-roblox-heroes-online_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/coin-master-cards-hack-2021_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/online-roblox-hack-2021_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/hacked-accounts-in-roblox_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/latest-free-spin-coin-master-daily_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/no-human-verification-coin-master-hack_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-promo-codes-for-coin-master_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-minecraft-codes_GM479516143.pdf
    • http://perpustakaan.ipts.ac.id/repository/roblox-report-hacker_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/giving-free-robux-in-this-roblox-group_GM431946152.pdf
    • http://perpustakaan.ipts.ac.id/repository/hackear-coin-master_GM406889139.pdf
    • http://perpustakaan.ipts.ac.id/repository/free-robux-on-google-map_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005197.bin
8b48097cc9977632fd9d9f66216220fb481042d403be6164f81d0117846b2eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5197 27324 bytes
font_01_sfnt_off0000904b.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904B 5696 bytes
font_02_sfnt_off00009d5d.bin
8cd03166a1f52358f1728f5b90da4fa4c8abf0c659cd270300425181024a0eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D5D 18724 bytes

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