Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a83b3506d33bf3…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 09:12:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 32ef12c59092d954f51ecda639986f6f SHA-1: e5ccd490fe4613bf52a8d6443510fab2b2019d45 SHA-256: e3a83b3506d33bf3a76eb99c16df393c3900c55ed2b6e1d0818fb0799f10ae59
200 Risk Score

Malware Insights

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

This PDF document employs a lure of free in-game currency and hacks, as indicated by the document body and multiple heuristic firings. It contains links to known malicious redirectors, such as http://netcdn.tw/app/431946152/how-to-get-free-robux-by-playing-meep-city-game-hack, which likely serve as a gateway to further malicious content or phishing pages. The presence of a 'password-protected archive' lure suggests an attempt to bypass security controls by encrypting the actual payload.

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.
  • 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
  • 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.tw/app/431946152/how-to-get-free-robux-by-playing-meep-city-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-things-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/cheats-for-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/where-is-the-hacking-station-clone-tycoon-2-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-build-a-boat-for-treasure-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-ios-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/moon-active_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-for-synapse-x_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-exploit-for-roblox-no-virus_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-got-talent-hack-piano_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-spin-link-2021_GM406889139.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_off00003138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3138 21864 bytes
SHA-256: 11e9d02e07e3dffed8a85ce65a5a6cecceec079c3ce134ba4bc3094674d280f2
font_01_sfnt_off00006149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 19696 bytes
SHA-256: 0e7c927a9d5c2f3b24da0ff547067a5a336164112e7df0d636dd13cc389b744e

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