Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4a0166e05378ad…

MALICIOUS

PDF

35.0 KB Created: 2021-07-01 09:02:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5d2ebff47a0df0533e66c9ffd1415736 SHA-1: 358164c9e84ef0734ac79f1bee7f30eca7e435c9 SHA-256: 6d4a0166e05378ad16cceef0021adfd3af6cac7f051df9797b8030b6581010aa
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary redirector URL associated with malicious activity. The document body and heuristics indicate a lure for game hacks and free currency, likely intended to lead users to further malicious content or phishing sites. The presence of a large number of external PDF links suggests a link farm designed to attract traffic.

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.
  • 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.
  • 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-scp-site-61-hack-game-hack In PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-mad-city-hack-red-boy_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-avatar-free-superhero-body_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/compte-a-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-tycoon-cash-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-do-you-get-free-skins-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-obby-gives-you-robux-for-free-no-password-required_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-hack-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-coin-master-unlimited_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
font_00_sfnt_off00002fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE5 22772 bytes
SHA-256: 25cc1f0d1d6c4f0dbc5f71f53d90611c15f5e5b47b653336d994ba44a5e57865
font_01_sfnt_off000062c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C9 19328 bytes
SHA-256: 1fab8de5700272c474ef191d62100722caf157cffba85789f3be016e50bb3418

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