Malicious PDF — malware analysis report

Static analysis result for SHA-256 b399df99d9ed92df…

MALICIOUS

PDF

46.7 KB Created: 2021-06-10 16:29:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a6bd3bbdafab06a99b68a5da995a0c0a SHA-1: 093ffaaf275ec54ca14d0f1ae258bc9b012570d0 SHA-256: b399df99d9ed92df409bd55a572a5bddd71d9fc012c7ba367f23f78968d5baa5
200 Risk Score

Malware Insights

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

The PDF document contains a lure for free game hacks and Robux, displaying a fake CAPTCHA to trick users into clicking a malicious link. This link redirects to known malicious infrastructure. The document's content and heuristics suggest it's designed to exploit user interest in free in-game currency or cheats, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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 https://netcdn.tw/app/431946152/free-robux-codes-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/real-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/mcpe-116_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hacks-para-el-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/blogspot-coin-master-free-spins_GM406889139.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_off00004e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E80 24216 bytes
SHA-256: cf72dcb5d5cbe19e6db12edc19cc82fabb987d91573c6323f4b556d9a2be00a3
font_01_sfnt_off00008588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8588 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00008f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4A 19732 bytes
SHA-256: b138e5f65a55b4539dfbc59033e0eaf46d53dcdebe789b6df968dd7ac205b77c

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