Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec44bc848a3514a…

MALICIOUS

PDF

34.8 KB Created: 2021-07-20 05:07:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0958ee8c539e553c5ab14562401dd94a SHA-1: 457795d34155ce1bcf92296ae0a275c8bd50453f SHA-256: fec44bc848a3514a7befb4b821a10a90c34676d6b9f35c3ad1a3d20d3c26487a
160 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users with promises of free game currency or hacks. One primary link, http://netcdn.tw/app/431946152/free-robux-no-verify-2021-game-hack, points to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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-no-verify-2021-game-hack In PDF document text
    • https://serviio.org/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://serviio.org/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://serviio.org/images/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://serviio.org/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://serviio.org/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • https://serviio.org/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://serviio.org/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://serviio.org/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://serviio.org/images/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • https://serviio.org/images/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off00003202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3202 22476 bytes
SHA-256: 5b8f4bff29307341c12e7ecc760864b5459235be5f540b31c7d1006ed9292758
font_01_sfnt_off000063df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DF 19036 bytes
SHA-256: c34bf7a65760171f34da3f69298eb915a2c7f2acfe0422042ed48294a4c22706