Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73949bf9c444915…

MALICIOUS

PDF

50.1 KB Created: 2021-05-15 23:30:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3e8f0b4d462243ee09918176b39e7c8c SHA-1: 44efe04dbca6115a2605cc25e6c217b1b531b6bc SHA-256: f73949bf9c4449155e5bd0d73cef38da2256095511205bca513009b8b3bba790
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to websites that promise game hacks, indicating a likely lure for users to download malicious content or engage in phishing. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent. No scripts were extracted, but the document's structure and embedded URLs suggest it's part of a campaign to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.xyz/app/406889139/how-to-hack-coin-master-in-pc-game-hack
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-free-robux-codes_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-free-robux-app_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id//repository/easiest-coin-master-hack_GM406889139.pdf
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-facebook-page_GM406889139.pdf
    • http://www.perpustakaan.unda.ac.id/repository/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • http://www.perpustakaan.unda.ac.id/repository/is-roblox-free-on-ps4_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id/repository/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdf
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://www.perpustakaan.unda.ac.id//repository/free-pet-snacks-coin-master_GM406889139.pdf
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-pin-codes_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdf
    • http://www.perpustakaan.unda.ac.id//repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id//repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdf
    • http://www.perpustakaan.unda.ac.id/repository/roblox-dominus-free_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id/repository/free-links-coin-master_GM406889139.pdf
    • http://www.perpustakaan.unda.ac.id//repository/roblox-free-draw_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id/repository/free-admin-roblox_GM431946152.pdf
    • http://www.perpustakaan.unda.ac.id/repository/roblox-hack-game_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c2f.bin
6559d2209d6310b7045a5dbf62b9c6242f865b6e6af99397d1ff7de242c3045d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C2F 24268 bytes
font_01_sfnt_off000083c2.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C2 2840 bytes
font_02_sfnt_off00008d6f.bin
e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6F 8676 bytes
font_03_sfnt_off0000a1fa.bin
7b7faa2806f4651d8f2caf7de4c42b1705e796111e9b1cb5aed7a196d14508bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1FA 18036 bytes

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