Malicious PDF — malware analysis report

Static analysis result for SHA-256 504573d138f6ba26…

MALICIOUS

PDF

34.8 KB Created: 2021-07-07 10:54:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: df63043f56c1a5d5b10fef109e26f3af SHA-1: 0ca469551fd5af20756300fad9544f6a529cfc23 SHA-256: 504573d138f6ba268053945d56698348325b65e11282c32b7dbc1445983c7efe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for game hacks and free currency, directing users to a known malicious redirector. The document body contains multiple URLs, including the primary malicious redirector http://netcdn.tw/app/406889139/coin-master-free-spins-link-today-instagram-game-hack. This indicates an attempt to lead users to potentially harmful content or further malware downloads.

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/coin-master-free-spins-link-today-instagram-game-hack In PDF document text
    • http://perpus.unik-kediri.ac.id/repository/a-promo-code-that-gives-us-free-robux-no-waiting_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/get-robux-free-no-disabling-ad-blocker_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-get-100-robux-for-free_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_off00002f7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F7E 23052 bytes
SHA-256: f6fca391b5e7d5e02842b271b4ed63883e87f276e93572af91a7959d9e93f2ae
font_01_sfnt_off00006350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6350 18960 bytes
SHA-256: 2b57405de0e85949a44aff108cdf7d94a29b82b397c72f5efb5695bba03a492e