Malicious PDF — malware analysis report

Static analysis result for SHA-256 18eb5aae88a8aeb1…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 19:12:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9a312080af0121e64705e844fc772d3f SHA-1: 267c5a25aac77d0bff71aee515acc8ef969fd803 SHA-256: 18eb5aae88a8aeb11dd13787070c051b7bc174f7cfc7ccda071af55d1ed4b1e2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links designed to lure users into clicking on game hack generators and free in-game currency sites. The primary link, http://netcdn.tw/app/431946152/https-oprewards-com-roblox-game-hack, appears to be a redirector to a potentially malicious site. The document body and heuristics indicate a large number of external links, suggesting a link farm or a phishing attempt to gather credentials or deliver further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.tw/app/431946152/https-oprewards-com-roblox-game-hack PDF link annotation
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pokemon-go-free-online-play_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hacking-my-best-friends-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.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_off00002ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD5 22504 bytes
SHA-256: 6595a246e07244ceff216131c0c0124adb2b7da59c188ee48cd7203c86339874
font_01_sfnt_off00005d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0F 19364 bytes
SHA-256: 5a5caa3ea5a7450f5ada42000dea20375fa148f76b5cf036c4c04236d009ba0c

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