Malicious PDF — malware analysis report

Static analysis result for SHA-256 638eed59853fb3a7…

MALICIOUS

PDF

50.3 KB Created: 2021-06-04 00:19:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bc1dca3e5424f06fd6828d37e5d62ff1 SHA-1: e1f20a8147da2d8a3578a6fa13410d318b1a167c SHA-256: 638eed59853fb3a7cf1bf269b7b7d03460f2780638fe5d20ccd15cc511de60a6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering 'free Robux' or game hacks, a common lure for malicious content. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically flags this behavior. While no scripts were directly extracted, the embedded URLs suggest the document is designed to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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-hack-2021-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/tiktok-free-view-easy-verification_GM835599320.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-hair-on-roblox-2021_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_off000052cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CB 29932 bytes
SHA-256: 9e92546c8341a383b5d8df979af47a99ddf181caba87967eca730c6b89b14aa5
font_01_sfnt_off00009573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9573 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5E 19084 bytes
SHA-256: bf126c80224e4ece1a877f3c45a4e2f725662c205f8b78a709aa4c80730d283c

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