Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a1f617519787f0…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 07:35:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c20d156a94096852088297d92316e4af SHA-1: 27df2ae4691c9bf32e1066db309d23e012627635 SHA-256: 87a1f617519787f09edcf5ad472e1127ae318c4344ecb16a5063c6c00f6d8dbc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free generators for popular games like Roblox and Minecraft. The primary lure directs users to 'netcdn.co', which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

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.co/app/431946152/break-free-roblox-music-id-game-hack In PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/gain-robux_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/roblox-free-robux-pin-code_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/how-to-hack-roblox-admin-commands-script_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/minecraft-free-download-mobile_GM479516143.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_off000030c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C6 22388 bytes
SHA-256: 882d996ee8fcb9c7ff08099088e2fc9dbeb157f60a73f712f1b0e317fbb152c0
font_01_sfnt_off00006263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6263 19448 bytes
SHA-256: 3b9b17a636a3a1e68889eee75baededda4673488d11a839d3ac7c68efcfa9914

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