Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77702d01e2d6460…

MALICIOUS

PDF

54.4 KB Created: 2021-05-12 23:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d930ac2b1187a35204355d8a4cb99131 SHA-1: dc4ce2c094cdc044391e8ba0a8d3d43a7fbb31be SHA-256: b77702d01e2d646045cad763ae44725e52209e51b08d8e8565ee1f6063dfe73d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of free game currency and hacks to entice users. It contains multiple embedded URLs pointing to external sites that are likely hosting malicious content or phishing pages. The ML classifier also flagged this PDF as malicious, supporting the observed lure and redirection behavior. No scripts were extracted, but the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-free-rubox-game-hack PDF link annotation
    • http://kids-academy.pl/images/get-robux-com_GM431946152.pdfIn PDF document text
    • http://kids-academy.pl/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://kids-academy.pl/images/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://kids-academy.pl/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://kids-academy.pl/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://kids-academy.pl/images/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://kids-academy.pl/images/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://kids-academy.pl/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://kids-academy.pl/images/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • http://kids-academy.pl/images/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://kids-academy.pl/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://kids-academy.pl/images/robux-games_GM431946152.pdfIn PDF document text
    • http://kids-academy.pl/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://kids-academy.pl/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://kids-academy.pl/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://kids-academy.pl/images/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://kids-academy.pl/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://kids-academy.pl/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://kids-academy.pl/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://kids-academy.pl/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bd7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD7 27808 bytes
SHA-256: ffaa09d5be524dc184de6965879c3e9a155d2b16db792bbcde59a14c60f68ddc
font_01_sfnt_off00008c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1D 4024 bytes
SHA-256: eb9273f8a0a7e347f9565508a06ae73a85b0d8a13fb7649dc8c1946f405f918c
font_02_sfnt_off000099b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99B8 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BF 3396 bytes
SHA-256: e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee
font_04_sfnt_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 18088 bytes
SHA-256: 03c92d59c548fbfdae08874221752d30f8caaed88781636bf7d18542e7c5fe52

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