Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27a072441af946e…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 08:03:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7946323b193fcc7b00c7b15f427b9b4a SHA-1: e1307f95f931cf39dd47369aaca045fb02b7bd88 SHA-256: e27a072441af946ea45e3fce991b97458a74d23c7ab189de3857d950dab47c43
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free virtual currency, indicating a lure for users to visit potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of such links were generated, and the ML classifier strongly flagged the document as malicious. The primary attack pattern involves directing users to external resources that likely host malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-get-free-robux-youtube-game-hack PDF link annotation
    • http://libnh.stikesnh.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-april-fools-hack_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_004_off00005356.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5356 25832 bytes
SHA-256: 8a5689a8328f4fa93201b3219ab83d7bfb12b95cb09978b2a098490462fe7dd9
font_01_sfnt_off00008ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBE 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_02_sfnt_off000099d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99D2 18444 bytes
SHA-256: c8869677d4d84c4518e8410e1128de6ae04a76f8db213e07b668dd1668cda2fe

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