Malicious PDF — malware analysis report

Static analysis result for SHA-256 46675386a051da7d…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 18:30:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4888fe2417cddfd0fb7b727f95d863b0 SHA-1: 72789d3f222bcd325d75627f63e50511e35e2e4e SHA-256: 46675386a051da7de44f22eb8d748a2c239e479d516122ac495d5de702254bf5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into downloading potentially malicious files or visiting scam websites, masquerading as game hacks and generators. The primary URL, https://netcdn.online/app/431946152/free-robux-only-username-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, likely for financial gain or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/free-robux-only-username-game-hack In PDF document text
    • https://cuc.ac.cr/userfiles/files/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/tiktok-free-view-iphone-theme_GM835599320.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/rbx-earn_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/get4mobilebiz-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/village-3-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-games-online-free-no-download_GM479516143.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
font_00_sfnt_off00004e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E1B 26424 bytes
SHA-256: 601e5f8ff213f6dfca47a271541a55492480070c2af2ddb99776601554082f2e
font_01_sfnt_off00008954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8954 18944 bytes
SHA-256: 70265b1ab56d97b784f4fe2fa404654962f548e46b6ffa550f521079ee450d9c

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