Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa9ace4143ce8a3…

MALICIOUS

PDF

48.7 KB Created: 2021-06-03 10:25:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a8c39641f25bc97d126a2e86c66d0cf2 SHA-1: 8392cee4ec72de45fa5c7d1c9cdb1eec2c7192fe SHA-256: 0fa9ace4143ce8a3b749f012f1d25c225e50de8c3e01dfcc343ecc330053478c
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, suggesting a lure to a malicious website. The document body and heuristics indicate a theme of 'free generators' or 'game hacks' to entice users. The presence of a password-protected archive lure suggests the document is intended to bypass initial security scans by encrypting a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-transformer-roblox-costumes-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-how-to-get-car-crushers-2-for-free_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-spins-for-coin-master_GM406889139.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_004_off00005126.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5126 26176 bytes
SHA-256: 37cd3c6ab36f46405e7306a112ac99cbae604fe6d4978d0d1927804d3bbd51aa
font_01_sfnt_off00008d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D39 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4A 18680 bytes
SHA-256: c2dc5b077bcf0536ea8746414157d1fb62dfb1e7f4db4237169b345c829ea758

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