Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c51e8c92162da71…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 01:27:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ecddf695b9e881da3d4c9e8020440fa5 SHA-1: bca36540acad78e8aab96f4f3338f95506103537 SHA-256: 0c51e8c92162da71863176d191878cbfab78ff720e259c59a2d9b6bb0f6cdfda
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as a 'free generator / game hack' lure. The document body and embedded URLs strongly suggest a phishing or scam attempt to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious redirector links and the lure indicate a high likelihood of user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-no-verification-game-hack In PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-hexus-free_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-on-roblox-in-2021-pyckel_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-now-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-lab-experiment-hack-script_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-robux-birth-day-hack_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/wahoo-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.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
font_00_sfnt_off000030a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A3 22280 bytes
SHA-256: 7a8f76536dc40f33e370c11b0943b3128d2e69e1b20c0277b23995ffa476c5da
font_01_sfnt_off0000622c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622C 19072 bytes
SHA-256: ace71d10471f941b47a74757ee9bffc2eb087028e16fd0b67ae59ecc13578840

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