Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a8e14642091243…

MALICIOUS

PDF

48.9 KB Created: 2021-05-20 02:39:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f9f25be012f96b77eebe63d03cb069b0 SHA-1: ba62a2af2b8467976c4d5676e1aced7dda5bf14e SHA-256: 21a8e14642091243aa6a59e90001bdbd8ae0bf3b1302cb18710bc4c2b7c434df
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, including one directly to 'robux-for-kids-game-hack', and a large number of other PDF links related to game hacks and free in-game currency. This indicates a link farm designed to redirect users to potentially malicious content or download sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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.xyz/app/431946152/robux-for-kids-game-hack PDF link annotation
    • https://www.acacss.com/images/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/tiktok-free-download_GM835599320.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/free-pet-snacks-coin-master_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_003_off00004771.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4771 33416 bytes
SHA-256: 568be333661dfd5890ec86306a7020d1bf09e2807396f7e54946e4f1d82abd71
font_01_sfnt_off00008feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFD 18308 bytes
SHA-256: 8a34bf7029799339b91ee5bbc9e7150d15a201a0a283206b71f5bacd63347ffe

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