Malicious PDF — malware analysis report

Static analysis result for SHA-256 4855fbeda474be9f…

MALICIOUS

PDF

50.2 KB Created: 2021-06-07 06:08:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4eab6e3b1235459765fa12e9ac58065a SHA-1: b54de1d22a354f1cb0c3cdb3bfb604f079088012 SHA-256: 4855fbeda474be9f080bcda3ac0297ac9233f6becfebc59e3eef54a8a52cf31d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which are SEO-optimized and point to game-related hacks and cheats. The presence of a 'download' button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or exploit kits. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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/red-boy-hack-roblox-download-game-hack PDF link annotation
    • http://www.sfakia-online.com/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000533c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533C 27164 bytes
SHA-256: 02b275686d4bf1b75f204c33bc65910c6993443c82f3c902007dae28414871cd
font_01_sfnt_off0000929f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x929F 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB1 18868 bytes
SHA-256: d59aab64873fd90dd7472de1f0a1358b1d22ef26cef49cb65a1fdb46a214177a

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