Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d60d749d057d06d…

MALICIOUS

PDF

34.5 KB Created: 2021-06-27 04:50:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3de88c7146999b44a42b30d6905afbba SHA-1: 875f4d015873381aa3bdf070ac3e4ec265f982a4 SHA-256: 8d60d749d057d06d8951063f0e36af2332c5a102c12cf579da7fbeb5f6f23e50
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and free currency, directing users to a malicious redirector URL. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a download button lure further support this. No scripts were extracted, but the document's structure and embedded links are designed to lead the user to potentially harmful content.

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/406889139/how-to-get-free-spins-for-coin-master-game-hack In PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/master-hack-coin_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/login-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-onligames-like-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-shirt-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/redline-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-by-just-joining-game_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/pubg-uc-iraq_GM1330123889.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F52 23332 bytes
SHA-256: 34d069ff875cee68c677207fff6fa487ff0019ed7a6608cf8d7c8499ed1e28e2
font_01_sfnt_off000063e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E4 18336 bytes
SHA-256: 23f71a9ba4d854b783c042dde3b810d75211435ebb04f16eb6963276a01a3aa2

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