Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a5088f79055994…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 09:03:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9ddc04ef1e06f422c51d49287cbe3541 SHA-1: 13f85bc707007592c127ab8c17d14626534beb42 SHA-256: 81a5088f790559943a6507a0bfb370b1837f6548a93bc8ac86b7fcf408ab6be6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appears to be a 'game hack' or 'free generator'. The primary link redirects to malicious infrastructure, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious redirector pattern, likely intended to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 https://netcdn.online/app/431946152/rbxdemon-game-hack In PDF document text
    • https://ourlady-elearning.com/userfiles/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-ban_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/pubg-uc-u-mobile_GM1330123889.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E88 25148 bytes
SHA-256: f46497f413d628e8f4042f0364a1d5efd36aa6b9f613f3f33b8052790f8c100f
font_01_sfnt_off000086a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A9 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off000090a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A6 18144 bytes
SHA-256: 84e994ea3e0766e4b6b44f1efc08852f1b1b6721f581ba32b946cb803bfb180d

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