Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8c3331d3813958…

MALICIOUS

PDF

47.7 KB Created: 2021-05-14 12:20:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ac8c4685915d8ca5d0c0c45ef7e732e1 SHA-1: c752034959011cc1cadc729459d0f8328a5579cb SHA-256: ca8c3331d3813958204cfb81f57bdd6ae6d003e791b8ec0dcf25ee96d4793175
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA 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 0.9013

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-get-free-roblox-gift-cards-game-hack PDF link annotation
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/robux-hacks-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_003_off00004cf0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF0 25888 bytes
SHA-256: 5ca6d06dd0fb6ff692c3150c53663934f305a635cdf3d5e33f2e0ed5fe0ee50d
font_01_sfnt_off0000883a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883A 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_02_sfnt_off000096c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C5 18740 bytes
SHA-256: 4ca4edcee29dbb5ec5fd43b786ee3a040f637d4fa80ece8255e459f77acc63d1

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