Malicious PDF — malware analysis report

Static analysis result for SHA-256 f573d63b4702b643…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 16:11:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 08b1c034e13824428ecf48063fc9195b SHA-1: f03cf0bcd21da5f0290e9e72174d53f5ec0dc1b3 SHA-256: f573d63b4702b64366b689d0d6ef5962d079164fd80b027117f588f5e9a2600a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game currency, directing users to a URL associated with malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The embedded URL is designed to trick users into visiting a site that likely hosts further malicious content or exploits.

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/431946152/free-robux-on-phone-game-hack In PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/pubg-uc-free-in-pakistan_GM1330123889.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/robux-now_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.twpuc.com.tw/upload/files/minecraft-free-online-games_GM479516143.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_off00002f47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F47 22940 bytes
SHA-256: 7b5b4b577e07480355bd66835a38d70e8eee21b21f8ca1eeb2c3ffc8eecf3cf3
font_01_sfnt_off000062bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BF 19036 bytes
SHA-256: 3bc7039bf1a02ee44cf77d87306d68fb788e2fdb5082ebb4bdc7c743d7253944

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