Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9524798805207f4…

MALICIOUS

PDF

41.9 KB Created: 2021-05-14 04:35:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 198e82a0f715a4da998b4c4bfe0a359a SHA-1: 2499e8cbf542e3b311ea40d34a401359313a54c4 SHA-256: e9524798805207f406e92a28299a8181e6f153efb31d8378da81ec36379fa2f9
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 0.9971

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 https://netcdn.xyz/app/406889139/hack-coin-master-without-verification-game-hack PDF link annotation
    • https://www.tartineartisanal.com/images/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://www.tartineartisanal.com/images/free-robux-stream_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_off00004ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD9 23964 bytes
SHA-256: 34c67efa39677414b3302c6f8eac6d66ed49e002903f4e714018ef074c22ae2b
font_01_sfnt_off00008160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8160 18356 bytes
SHA-256: aefaa71949a7bdb31c5263769784b91b60fa36dc046093ce5bdaf3e1e31da4c1

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