Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e91ceb70f7fce2e…

MALICIOUS

PDF

34.6 KB Created: 2021-06-28 09:20:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c51c8e1517821da4c3f5718896390c01 SHA-1: d8bcb9079d52bd2fd4cddaca59428c53cb757f39 SHA-256: 3e91ceb70f7fce2ec4e202d47b5a71bf8538f0ee681eabb1de137441a46fdff3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a malicious redirector, specifically advertising 'free generator / game hack' lures. The document body and heuristics strongly indicate a social engineering tactic to trick users into visiting malicious sites, likely for further malware delivery or credential harvesting. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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-robux-not-fake-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/2021-how-to-free-admin-commands-to-your-roblox-gane_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robux-redeem_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-2021-robux-in-game-cheat_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/https-enhelprobloxcom-hc-enus-articles-202120210myaccountwashacked_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/cheats-on-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacks-for-twisted-paintball-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-in-booga-booga-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-star-wars-group-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/cheats-for-getting-money-in-roblox-meep-city_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/como-quitar-no-soy-un-robot-en-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-roblox-with-python_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-coins-and-spins-app_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_off00002f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F47 22740 bytes
SHA-256: c4f188066b0bcdbb2b9d1602ab34b4f672e91853da0af414ee7c45802a39d3e7
font_01_sfnt_off0000625b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 18992 bytes
SHA-256: e4ac39d57ff956450bb8dd48df15acc1078399c4d14e18067568ebfa6ae85f6b

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