Malicious PDF — malware analysis report

Static analysis result for SHA-256 e158f18550a2e0bd…

MALICIOUS

PDF

46.2 KB Created: 2021-05-13 00:32:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c8b0288e36ec2303e58d030cf3a63bb7 SHA-1: 0440df63980ffb114ff4530d37d4f900bd166495 SHA-256: e158f18550a2e0bda1976a831e5d3bbb62b2119dfc2c865a293fe7a3647cc17f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/431946152/roblox-jailbreak-hack-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-fan_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_003_off0000499b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x499B 25444 bytes
SHA-256: 8d988486fe59e13965164f62a5231ac4f0900b3e4005fc3b309764a1f178ba05
font_01_sfnt_off0000846e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846E 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off00009195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9195 18468 bytes
SHA-256: deecbf3382f29be7f744c5f376599cf902ae77510bc823f5987ac0412c139863

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