Malicious PDF — malware analysis report

Static analysis result for SHA-256 835f9a8643da7fc8…

MALICIOUS

PDF

44.9 KB Created: 2021-05-12 19:02:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0d086f46373e36bd60d59a88067056a5 SHA-1: d1ddc2363d5d74fa25f3b00dbd7592a7958d8b06 SHA-256: 835f9a8643da7fc8c366f726ce869b090fbea2833d1c57e54024cb42e04ab7cb
122 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to appear as search engine results for game hacks. The primary URL and several others point to game-related exploits, suggesting a lure to download further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.
  • 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/431946152/robux-giver-game-hack
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-spin-hack-link_GM406889139.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/can-i-get-robux-for-free_GM431946152.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-blogspot_GM406889139.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-hack-tool-v1-9_GM406889139.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/minecraft-auto-miner-hack_GM479516143.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/mc-hacks_GM479516143.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-free-daily-spins_GM406889139.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-free-spins-link-today-blogspot_GM406889139.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/roblox-password-hacker_GM431946152.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/free-premium-roblox_GM431946152.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/minecraft-hacks-for-2b2t_GM479516143.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-hack-apk-app_GM406889139.pdf
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac9.bin
20a6dcfeaf0a82e1033f6b4eab12ecdd73d32b7b76a2b70608c3e8f2697c66e7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC9 29216 bytes
font_01_sfnt_off00008e13.bin
7a12c9f5eb0a0db1f8f257aa9a01d8091f877bc5a7f544a47565c95aa29e59f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E13 18084 bytes

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