Malicious PDF — malware analysis report

Static analysis result for SHA-256 423d1a53f4916362…

MALICIOUS

PDF

34.1 KB Created: 2021-06-20 12:00:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4f8a1dac61ce4a07894b433ef2edabdb SHA-1: 0e6acef826849fc2300547c19354c2ad204ccf5e SHA-256: 423d1a53f491636249a8343e8d0a3043649a0ac5f204cdaa262ee43117282fd0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering game hacks and exploits, such as 'roblox-exploit-hack-2021-game-hack'. The document body and heuristics indicate a lure for free in-game currency or account hacks, consistent with phishing or scam tactics. No scripts were extracted, but the primary attack pattern involves directing users to malicious infrastructure via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.co/app/431946152/roblox-exploit-hack-2021-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-download_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-mad-city-free-vip-servers-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-err-face-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-free-shirts-xxtentacion_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-avatar-animations-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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_off00002db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB4 22112 bytes
SHA-256: 63e5be41878339ff74d9a0e04d0b374269c0e6d8ba362bdd0c84e73a291fb464
font_01_sfnt_off00005e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8D 19460 bytes
SHA-256: 9fb685d7ea451362e7a00d4937e9539e0af7c1a0ce1309e72b5561e7687692f2

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