Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff26ebffdb4e8f5…

MALICIOUS

PDF

46.8 KB Created: 2021-05-13 16:47:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 86b8a9f16e993b5b9e31f0b96e31abe0 SHA-1: 8e49d2ea45852bc8813c3d1ef682613e8deedf77 SHA-256: 9ff26ebffdb4e8f5e5938b7c0ead6d9bf8e45c1ad06c61c9e99744308e750db1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The document body and heuristics confirm the intent is to trick users into visiting these malicious URLs. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/free-robux-not-a-scam-game-hack In PDF document text
    • https://fkg.usu.ac.id/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/roblox-sexually_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://fkg.usu.ac.id/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A27 26160 bytes
SHA-256: 671df4971e53921b3c9759780622104e56964b7b7bf3550bf733e17af5a3048b
font_01_sfnt_off00008694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8694 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000093a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A6 18608 bytes
SHA-256: 99f87fd07008d852f5f659b56544f95afedf5ace2cc64bf1a6de85fca727b1b9

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