Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f3bcd3073b2e61…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 22:05:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8462a31ab538e1e1110d1bec5c3d0645 SHA-1: a62d4baf2099d023dfd580afd8bc0f183e9826c8 SHA-256: c7f3bcd3073b2e6134fe840f730d06262cd0d29b62c772f306a6d5184d25f056
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure is a link to 'how-to-get-free-robux-no-human-verification-game-hack'. The document body and embedded URLs strongly suggest a social engineering tactic to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.tw/app/431946152/how-to-get-free-robux-no-human-verification-game-hack In PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-project-jojo-white-snake-free_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/pokemon-go-free-808-pokedex_GM1094591345.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-assassin-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-roblox-pin-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/clover-online-roblox-gui-hack_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-lego-hacking-script_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-hack-ultra-speed_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-hack-999999-robux-tablet_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-project-jojo-free-items-exploit_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-robux-real_GM431946152.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_off0000306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306C 22552 bytes
SHA-256: 32964ad8397998f500a2a8b230845305bea8b784c399e3194864d277684790f8
font_01_sfnt_off0000626c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626C 19496 bytes
SHA-256: 1b5d617a8bdf7849f857e8bf3a00ea7a9d2795cdb388484b070bb3e34f65ceb1

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