Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cd61290c4dddbf…

MALICIOUS

PDF

47.1 KB Created: 2021-06-06 23:29:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2fa76f63fc069747832ccc46f363ef20 SHA-1: d141ba80b0261e6333f1683bd34e646e2486244b SHA-256: 61cd61290c4dddbfc111b2abaed053e942f243d8b26b7fe9f16bbd31c16e71a3
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, masquerading as a lure for free in-game items. The ML classifier strongly indicates maliciousness, and the presence of multiple redirector links points to a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded URLs suggest it's designed to trick users into navigating to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/five-roblox-games-that-give-free-robux-game-hack In PDF document text
    • http://vagency.us/images/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://vagency.us/images/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/tiktok-free_GM835599320.pdfIn PDF document text
    • http://vagency.us/images/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://vagency.us/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://vagency.us/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://vagency.us/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://vagency.us/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://vagency.us/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://vagency.us/images/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://vagency.us/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://vagency.us/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://vagency.us/images/coin-master-free-spins-for-iphone_GM406889139.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_004_off00004fa6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FA6 30172 bytes
SHA-256: 1c2b560639aeb70262fab7dd4201e586b61f63de3928c20ceeb8591b5d3ca22c
font_01_sfnt_off000093a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A8 19080 bytes
SHA-256: aeccd052c4c30cf3817cb959ab7a22ae71cb016fe5fbd9e9b792e4614bb31356

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