Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87b073016dd771a…

MALICIOUS

PDF

34.4 KB Created: 2021-06-19 17:46:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e0d56a0ef6747e29c1246dc8607e0ba7 SHA-1: 2d5d498b97343ad12e955cf611ed2d3f7cd9a03e SHA-256: d87b073016dd771aea0096386d28719763b9fca97e87bf3435ed55aaf0eb2b1c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as game hacks and generators. The primary lure, 'free-backdoor-roblox-game-hack', is hosted on netcdn.co, which is flagged as malicious. The document body and heuristics indicate a social engineering tactic to trick users into visiting these sites, likely for further malware delivery or credential harvesting.

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/free-backdoor-roblox-game-hack In PDF document text
    • http://stpc.it/images/how-to-hack-into-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-robux-cheat-way_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/goo-recording-for-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/roblox-apocalypse-rising-hack-script_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/pubg-uc-qiwi_GM1330123889.pdfIn PDF document text
    • http://stpc.it/images/how-to-hack-an-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/free-admin-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/claimrbx-free-robux_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_off00002e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6B 22912 bytes
SHA-256: 92e3b8a4867a91fd920e792f04713af93adef8d5ebfb61c4f569169c401a76fc
font_01_sfnt_off00006220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6220 18808 bytes
SHA-256: b4c81cae2e05105214f30ac937a20e88097053273a40213e327af185a2ae72c0

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