Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b6077f02a18694…

MALICIOUS

PDF

34.5 KB Created: 2021-06-26 09:47:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f1fc200d377d5f864cad3ec01dd3339b SHA-1: c7c3124b7d5695d9219fcaa6ae673ce315e0a8a5 SHA-256: 57b6077f02a186948d7d055a3abd81e60736a6d6eb339ecd438dfbfe08c47ee8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.co', which is flagged as a malicious redirector. The document body and heuristics indicate a lure for free game currency or hacks, likely leading to a phishing or malware download site. No scripts were extracted, but the embedded URLs and redirector activity are strong indicators of malicious intent.

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.co/app/431946152/buy-robux-for-free-2021-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-booga-booga-cheat-engine-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/cheat-engine-2021-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/a-promo-code-that-gives-us-free-robux-no-waiting_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/redeem-roblox-virtual-item-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-robux-online-hacker_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-fast-and-easy-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-robux-generator-no-download_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
font_00_sfnt_off00002ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF2 22104 bytes
SHA-256: f1ad1c7f6115d95fccd56b6d7317cd774b62d46d39924f1443187a8a1c9f410d
font_01_sfnt_off00006111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 19300 bytes
SHA-256: e03a46fba3515dab0dcf470c7e6035e5ea44668780ca69c8145871e6cd04bffa

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