Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d600feee2361e5…

MALICIOUS

PDF

35.0 KB Created: 2021-06-29 12:39:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 16d034bbe586ae7b094622d4d0069370 SHA-1: 84d57b841240ccfc5cf2f32bae648ed706c7bacf SHA-256: 36d600feee2361e513b3ac44f7389feae38e19481d30e316011c9380d90bd0c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body and heuristics indicate a lure for game-related cheats, specifically targeting Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is 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/assisin-roblox-hack-game-hack In PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/tiktok-free-view-iphone-theme_GM835599320.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/www-rubux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/set-you-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-hack-tool-site_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-tiktok-followers-no-human-verification-or-survey_GM835599320.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_off00003146.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3146 22972 bytes
SHA-256: 8326839d2ab96112bea858b30bc83faea749a6a8a3e9fdf649f9fcdcbf0321da
font_01_sfnt_off000064b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B2 18776 bytes
SHA-256: 5f98a5b00890c2180a57d0e7c1ef83a2494e5ad676e390278ee06a0c489c7522

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