Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6faaf7e6de2f508…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 04:09:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b95b70f8bab0d06c207b139959c5757d SHA-1: ca2c15397a257e6eafd9ce84d5e34097a8367a16 SHA-256: c6faaf7e6de2f508764794fd0d10b28cbf9e8221ad65e69664a82a7a3f38aeb6
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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 http://netcdn.co/app/431946152/how-to-be-unbanned-from-game-in-roblox-hack-game-hack PDF link annotation
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-finak-stand-cheat_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-cloth-roblox-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/can-roblox-hack-your-phone_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-robux-game-link_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC0 22660 bytes
SHA-256: 91ac688d4d5251b90bcb224283fc2b3db367f639968bd1c373a8eac91b4ac064
font_01_sfnt_off0000627d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627D 19420 bytes
SHA-256: f69b70261d976251764a292da6b21eb0e4b7901893320a70383da4d631e7831d

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