Malicious PDF — malware analysis report

Static analysis result for SHA-256 f686d58d2cce1f6e…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 20:12:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7d6a78a4528335819589859b4f97d289 SHA-1: a9aa48c14b5c98378942e1a040e061d756732788 SHA-256: f686d58d2cce1f6ed68017b0f4f622157985da7a3e785286d1b40e6eadd24d4c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a free generator or game hack. These links redirect to malicious infrastructure, specifically the URL https://netcdn.online/app/431946152/free-robux-survey-game-hack. The document body and heuristics indicate a social engineering tactic to trick users into visiting a potentially harmful site, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-survey-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/tiktok-free-jazz_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/is-tiktok-free-on-voxi_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pokemon-go-free-event_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/com-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/este-hack-de-robux_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_004_off00004c46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C46 27296 bytes
SHA-256: d35cef1797ec6eaf93ffaf56a47f45d175e4a8012c21a894c79a59ede527210d
font_01_sfnt_off00008a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7F 18308 bytes
SHA-256: 74a940f1217583ab80956cd168fb81f959241543e2b3413e790743682303989f

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