Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1545b79a68220e…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 19:55:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a2310b644cda7e931024bcbd263a7dec SHA-1: 0e7407588d6d7c47892fc7897d4c3554468e596e SHA-256: 8b1545b79a68220ef3d06409e8c0ce7b57827b4cab97c077a599f3864e0d0109
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document body and extracted URLs indicate a lure for free in-game currency (Robux) and game hacks, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the content suggest it is designed to lead the user to download 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-that-actually-works-2021-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-accounts-today_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-easy-tix-cheat_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-form-rbfarm_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/wall-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pubg-uc-20210_GM1330123889.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-hack-account-real_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-old-roblox-account-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-let-them-remain-cheat_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-speedhack-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-twitter_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3077 22732 bytes
SHA-256: 8c1345bfaeaf69a4d7cd774d2217fc1c854557240f7dce776a46d05f2eb79cec
font_01_sfnt_off0000638e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638E 20008 bytes
SHA-256: 8708610d65edee27054ce301a9bd75c7c559fd6231599c341fc0984ebcbede77

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