Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d6c85a8e0e9b44…

MALICIOUS

PDF

56.5 KB Created: 2021-05-11 22:00:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 54f8803f2cbdd5c5369909e572563ca4 SHA-1: 458cda15e37848e57542dadfa845a687fa6e7485 SHA-256: c3d6c85a8e0e9b44ce4de94981fbcc3432c32cdc05331f72930e9d280d9592db
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 0.9400

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-robux-2021-game-hack PDF link annotation
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/robux-money_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/roblox-earn_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning-min4jakarta.sch.id/__statics/gudangsoal/files/roblox-source_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
font_00_sfnt_off00004de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE5 36656 bytes
SHA-256: 19af8eba2974db762cf2b172f066a002fbd4409b8ebd83bc926e77530a9bc7b4
font_01_sfnt_off00009ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF2 8132 bytes
SHA-256: e6d68e720ea5acf9dccbf7ffde18db6f65c62a99ab7725aa43e30329033a7787
font_02_sfnt_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 18684 bytes
SHA-256: 662354714a7c4aa127b8bd681013e9d5d113fbfc5a2f5afb2d34764175bb04a5

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