Malicious PDF — malware analysis report

Static analysis result for SHA-256 35efe7bbccb0eb9c…

MALICIOUS

PDF

34.8 KB Created: 2021-06-26 21:35:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6366c779c93bf095df9ee9f2cd85375a SHA-1: 40e1d694565f88018fe7600fb4fdeb44564db5ae SHA-256: 35efe7bbccb0eb9cf9bc9d2cb2752e6d5d774627a9f236a21df6d4ef82fb3268
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector at http://netcdn.co/app/431946152/roblox-free-wings-hack-game-hack. These links are presented as 'free generator / game hack' lures, aiming to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/roblox-free-wings-hack-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robux-free-2021-septender_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/download-free-cool-roblox-outfits-for-man_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-bee-swarm-simulator-hack-script_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/brixton-south-london-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/when-tiktok-free-will_GM835599320.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/dl-roblox-hack-scripts-pastebin_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_off00003011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3011 22684 bytes
SHA-256: ed5882f7c414a47a064d2d495cf7626a967d6e0ae281406f9e44726e3838978c
font_01_sfnt_off000062d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D1 19136 bytes
SHA-256: ed8b882f3eecb06062f07dcfa422161371c6bc181d2439e40b8aee46b00b6890