Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b872a9e9dc38bb…

MALICIOUS

PDF

34.9 KB Created: 2021-06-21 08:25:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1850c0f403d315b5d0d4b32365b68268 SHA-1: 68350605c83d1d0b5c58f9af1fcaf4cd9fad2806 SHA-256: c2b872a9e9dc38bb92579e3dfebc756cd143ba5e0fd8e163d658be25318bbbb0
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/479516143/free-minecraft-skins-girl-game-hack PDF link annotation
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/free-robux-jail-break_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/roblox-free-cbro-skins_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/firestone-training-map-free-model-leaked-roblox_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/roblox-hack-free-download-for-android_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/pokemon-go-free-zip_GM1094591345.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/free-halloween-costumes-on-roblox_GM431946152.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://royalindianjourney.co.in/uploaded_files/userfiles/files/mathep_GM431946152.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_off00003444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3444 22568 bytes
SHA-256: 750800f153d6ce47a25599cecefadc27e14f590f7118007cda877d9e052af2c5
font_01_sfnt_off00006697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 18100 bytes
SHA-256: b76f3dac7b7b3cf9eeb40e8d40f3dfeb641263e859efa56376b8d43c754683ba

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