Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea97ac833714ddb…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 09:13:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a2139c8fdc28d6396c8e6496d85e1695 SHA-1: 2dcb4a658c1be4e481ef5abbda138cb23ae0ea99 SHA-256: 5ea97ac833714ddb9e4bcf699900e22e522f8e91d192e89f6b680f7873b1bff4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Free Robux' and includes an external URI pointing to a suspicious domain. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external links and the nature of the lure suggest an attempt to trick the user into downloading a second-stage payload.

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.tw/app/431946152/free-robux-by-watching-ads-game-hack In PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/robux-hack-no-human-verification-real_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/hack-prison-life-roblox-noviember2021_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/wanna-join-my-free-giftcard-giveaway-roblox-id_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/roblox-com-games-keyword-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/earn-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/how-to-get-a-free-boombox-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://www.brightwake.co.uk/uploads/files/files/coin-coin-master-hack_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_off000030c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C7 22724 bytes
SHA-256: ffb32359f665c7c05deacb01dd11426aefcc1e9643db64ce6b5a9275201078d4
font_01_sfnt_off0000636f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 19660 bytes
SHA-256: f0cdf6166c464805662a9cde01402bcc449eb6222422d9d5af766ad530424c87

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