Malicious PDF — malware analysis report

Static analysis result for SHA-256 6601fb3e015bed78…

MALICIOUS

PDF

43.1 KB Created: 2021-05-12 07:33:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4754e3222dd7105431fb149bc8b90ab4 SHA-1: 6a98e24623d001e26a769c8adae5bbf6eeb90289 SHA-256: 6601fb3e015bed786506cf9a90755f3e4b95283e299b10077d2c9f7dfba1e49a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting game hacks and free spins. The document body, though partially corrupted, contains text and URLs consistent with a lure for potentially unwanted or malicious content. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to direct users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/coin-master-links-for-free-spins-2021-game-hack In PDF document text
    • https://www.donjastubica.hr/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-cp_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-system_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/robux-gratis_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D97 24924 bytes
SHA-256: 391223172d0d4ed0678f70c78ae786b85ba3e783b5cce306e82a6faa86e53eae
font_01_sfnt_off0000859c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859C 18456 bytes
SHA-256: a92e7a86c8f96ab5d5d3ed0cab2d9be7dec7c1a4821e4e0502d142dbf0f5217f

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