Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcf8b43f8e19e35…

MALICIOUS

PDF

33.9 KB Created: 2021-06-30 23:09:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f02c71a437bbccacb2a325296c7ed374 SHA-1: 17eededaddfa1e6600bab85d2c530f0afdf2ed5b SHA-256: 8dcf8b43f8e19e35dac209526ccef414cdab3bc3b61b423c0ee713a21b41c3a3
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and a link to a known malicious redirector. The primary link, http://netcdn.co/app/431946152/godmode-hacks-roblox-game-hack, is associated with the lure and likely serves as the initial stage for downloading a secondary payload. The document's content and heuristics strongly suggest a phishing or social engineering attack aimed at tricking users into executing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.co/app/431946152/godmode-hacks-roblox-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-account-giveaway-with-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/ninja-legends-roblox-hacked-pet_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-promo-codes-2021-no-inspect_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-gift-cards-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/somebody-hacked-my-roblox-account-prestonplayz_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/dfield-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-robux-easily-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-blackberry-hack-download_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-robux-generator-app-hacked_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-robux-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-ralsei-roblox-tshirt_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-ban_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB4 21840 bytes
SHA-256: 48af1a8733110d357f0b7dca77f81e01e1cb2fa15d7ac1f0471636b56b3ef67b
font_01_sfnt_off00005f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1B 19092 bytes
SHA-256: c5fa456f1425bee61c31d1c52f052af5982a7fde5a614f394e343f5d59a98d40

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