Malicious PDF — malware analysis report

Static analysis result for SHA-256 861334c6363c650b…

MALICIOUS

PDF

45.4 KB Created: 2021-05-16 08:02:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 33f53ccd99cff80c7b6e6c89a8e16162 SHA-1: f76736ad92b08955c4193d98bc3a5dc78a996459 SHA-256: 861334c6363c650b041e9ead1a8d93053d156744dbb310c58e26149e3055d440
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and websites offering game hacks and free currency. The document body and embedded links suggest a lure for users seeking in-game advantages, which is a common tactic for distributing malware or leading to phishing sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://netcdn.xyz/app/431946152/websites-that-give-free-robux-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000043b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43B8 27516 bytes
SHA-256: 4e2c60d90c753bf9cd69d259772ba012a92f9e5dba6de81b1c7374065b16fe5a
font_01_sfnt_off00008373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8373 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00008d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 18944 bytes
SHA-256: 78a0fcf68a5d31112d03f33f6a87e59a8dd4ec5e5d54fb5213929ff381de215f

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