Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7af5573814cdba6…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 12:29:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d0c2cc721fb37b882ae580efc7d2f041 SHA-1: ac64d5565d1a74577fd8c648f54a34c11cfa8b16 SHA-256: d7af5573814cdba60c45c0755545ca760dc383bcf37ba17c9c14537ebb7550dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary link, http://netcdn.tw/app/431946152/roblox-free-pants-game-hack, is identified as a malicious redirector. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leveraging embedded JavaScript for redirection.

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/roblox-free-pants-game-hack In PDF document text
    • https://hotelyetihome.com/userfiles/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/free-robux-no-apps-or-surveys_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/rc8-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/free-roblox-account-2021-december_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/real-robux-codes_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/free-robux-glitch-codes_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/roblox-robux-hack-download-ios_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/minecraft-free-online_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_off00003334.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3334 22904 bytes
SHA-256: f4628eba62fb2ddb3f4416d81b8a4b78e5dc5fe222bfef60aea04a33c3862daf
font_01_sfnt_off000066b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B8 18908 bytes
SHA-256: 376274ef1d4ee474fe23327416bb47019a8b6fd7bc11859318923c0484900617

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