Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cea2019c528712…

MALICIOUS

PDF

49.3 KB Created: 2021-06-04 03:16:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4b729d4e43014070e9bc1a1bab3d0824 SHA-1: ab5c59fa09fe0e8604425ef21bc3f0a2030e4a5e SHA-256: c9cea2019c5287129dd7d7971dec8532a1d404bb5b8e6f2e4f3780b18b60c32f
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 0.9796

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-do-you-get-free-robux-game-hack PDF link annotation
    • http://biblioteca.ganexa.edu.pa/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-village-cost_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_off0000513f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x513F 26884 bytes
SHA-256: d52dcee242a75fd5773b7cd488f71871405cfaa63e89403da7e4752f8f04743c
font_01_sfnt_off00008ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFE 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0F 18612 bytes
SHA-256: 37b0398febc23a1417b5642eaebf6c5e0b941c8fdaeae9a9e3ba89062b3e12f9

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