Malicious PDF — malware analysis report

Static analysis result for SHA-256 de136fb8b7b2ae7c…

MALICIOUS

PDF

48.2 KB Created: 2021-06-08 18:36:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 875c9033196997cf86b45c42d49130e7 SHA-1: 50b4f49a5e8d23ee16517b5c5a429e96e1f7312f SHA-256: de136fb8b7b2ae7c9b120b4812018c7e03d437e3c1831c45f0fb6432b77ceedf
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 0.9796

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.tw/app/431946152/roblox-toolbox-hack-game-hack PDF link annotation
    • http://library.ulb.ac.id//repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/original-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/can-pokemon-go-free-evolve-after-trade_GM1094591345.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/freerubux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/rewardex-robux_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_004_off000051a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A0 26864 bytes
SHA-256: e6abb620c859f0c26e7979401e806d1ef2663af6962450f60a8a71ecc0584483
font_01_sfnt_off00008e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5C 3512 bytes
SHA-256: d2fbe445e4228ea2e3d75d3e8f0f84124f9dd8d3d0cf2c6e4e63bcca92f2519f
font_02_sfnt_off000099f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99F0 18184 bytes
SHA-256: 013fb0d15739886c690681602890bab302e53e27eafef558ee9de99737454ccf

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