Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b2be8943f7f232…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 18:08:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 10a1970a57a3a15ab8132c5d42cfcadf SHA-1: 1b966c17184bc41eaf4c76a70a30c43a52907e63 SHA-256: f4b2be8943f7f2325e1d818ea38c9af735fcbb2c5be3e45afd3643d7419ae305
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, masquerading as game hacks and free item generators. The primary lure URL is http://netcdn.tw/app/406889139/free-spins-and-coins-for-coin-master-game-game-hack, which is flagged as a malicious redirector. The document's structure and content strongly suggest a phishing or scam attempt designed to lead users to potentially harmful sites.

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-spins-and-coins-for-coin-master-game-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/c-rex-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-someone-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/pubg-uc-price-in-uae_GM1330123889.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_off0000338a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338A 22620 bytes
SHA-256: 58684fd80a5638c4629cbda93a8e1e0fd6ab2b8228b5889aa83a349d0df40ea9
font_01_sfnt_off0000661d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x661D 18608 bytes
SHA-256: 31982f023cf9e8334e0247a56239ce43a369afef10c4502d97e5781750ca878f

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