Malicious PDF — malware analysis report

Static analysis result for SHA-256 23efdd26aa3dd36d…

MALICIOUS

PDF

45.9 KB Created: 2021-06-10 18:19:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ecb740deaa4d4cbe071d5da4d6abf03b SHA-1: d67fdf92670dec2185a293a42a6f7232371fa0bd SHA-256: 23efdd26aa3dd36d615a38d8fdc737a595569867c0bf0a42baf35ed6731890e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game items or hacks. The primary link directs to a page offering 'free Robux card codes', a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect the user to a site that likely hosts further malicious content or exploits.

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/free-robux-card-codes-feb-21-2021-game-hack In PDF document text
    • https://vstarnippers.com/images/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-game_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/robux-generator_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/watch-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://vstarnippers.com/images/roblox-counter-blox-spin-bot-hack_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-link-app_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/nre-roblox-adopt-me-hack-script-money-glitch-tizi-artizi_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-free-gifts_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_off00005322.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5322 26480 bytes
SHA-256: d20fbbf07a299f0c254723e4544f670c6b9a31e53e348d931acdacc32eb1e3cb
font_01_sfnt_off00008f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 18820 bytes
SHA-256: 8f7adc25dd4285cf6c466743e8e66bd83fd87eecdd754f8f2b103eb4ef0d4e7f

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