Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f35a66829ed1c9…

MALICIOUS

PDF

46.2 KB Created: 2021-06-10 20:50:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d1a443a4a903119a2e835824c8cdbe23 SHA-1: b99cbfd8beea64db192a33529dea56c4a4982da4 SHA-256: 63f35a66829ed1c9240bdbc8e3a8ad880c4579e4d865ca742bf062494d3e0c3a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors, disguised as game hack generators. The primary lure is a link to 'new-roblox-infinite-jump-exploit-hack-working-2021-game-hack'. The document body and embedded links suggest a phishing or scam attempt to trick users into visiting malicious websites. No scripts were extracted, but the presence of malicious links and the ML classifier firing indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/new-roblox-infinite-jump-exploit-hack-working-2021-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/tiktok-free-online-books_GM835599320.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/pokemon-go-free-fire_GM1094591345.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E7 25712 bytes
SHA-256: 7c7e8bb1a2f20702a3786e51afd0c4ebb619726a5aa9c814d9d004493a410868
font_01_sfnt_off00008c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3D 20200 bytes
SHA-256: 7307bfed13ed4730a15cfa54645e4ba3c9f40e2c628b54ef179b8d8258f80b6e

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