Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15f96a9f94d4c82…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 05:13:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1f3f2ac260a0695df39967570460029d SHA-1: 8436a92d7fb56e8c2a430d3d6c412ca6442239da SHA-256: a15f96a9f94d4c82176492fda66a124859c33d69d69175ea82ea5f0e7e7bccba
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.tw/app/431946152/what-is-a-robux-game-hack PDF link annotation
    • https://5dollarslogo.com/ckfinder/userfiles/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/synapse-x-download-free-roblox_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-roblox-promo-codes-2021-december_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-robux-hack-pastebin_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/free-robux-no-survey-no-human-verification-no-download_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/hack-roblox-jailbreak-mode_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-get-free-robux-with-inspect-2021_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://5dollarslogo.com/ckfinder/userfiles/files/minecraft-free-online-games_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_off000031e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E3 22204 bytes
SHA-256: bee01408cfe79601d5c277b274ee6aa41ffd5ed04a6f2fded53a8b8f38c47235
font_01_sfnt_off000062fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 19020 bytes
SHA-256: c4929e2cccccb6c645c3e246f213aba1e3fbbbd784ea000777d464120741ffc0

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