Malicious PDF — malware analysis report

Static analysis result for SHA-256 e331e9d814d03c6f…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 08:41:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e834ef6157665b81ecad3461ec4d4238 SHA-1: 531b09199d35b475702de64ab6daeebf1a1be043 SHA-256: e331e9d814d03c6fcc1ab7e03d5afb799125921c81807ba06690862ba434cd80
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a game hack generator, aiming to lure users into downloading potentially harmful content. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or malware distribution attempt.

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/406889139/free-spin-app-for-coin-master-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-into-other-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-tips_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-items-in-roblox-games_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-a-roblox-account-no-bullshit_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-verification-at-all_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
stream_002_off00003121.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3121 22476 bytes
SHA-256: ecaac6c3bbd62bab72940a07df518f717b1ec53b2eea27c58ab8f8034fac1e86
font_01_sfnt_off00006347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 18176 bytes
SHA-256: 1738a9f57d3e4d23f42eb341396c69ec63b4fe973af11c87a8c9f0948a11dc55

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