Malicious PDF — malware analysis report

Static analysis result for SHA-256 522f5d92a5d49271…

MALICIOUS

PDF

44.8 KB Created: 2021-05-19 23:11:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 52990023e725ea482ad015b64661b14a SHA-1: 54650487b7e6f173668dad96d8de388436342381 SHA-256: 522f5d92a5d4927148ce1d0042114a7a54949b48dd4ccac95d9c7b2581db0f26
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links and a call-to-action phrase, directing users to a known malicious redirector. The primary lure appears to be related to 'free Robux' or game hacks, a common social engineering tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document structure and embedded URLs are indicative of a phishing or scam attempt.

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 https://netcdn.xyz/app/431946152/free-robux-no-human-verify-game-hack In PDF document text
    • http://artindex.pro/images/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/how-to-get-free-roblox_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
font_00_sfnt_off00004b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B83 28044 bytes
SHA-256: 156a2b34a1d29be97e193cf62a45e5f7733c331a92374ae760e5c6fc473a0d18
font_01_sfnt_off00008b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B24 18936 bytes
SHA-256: 1a7af96eb5386f0345b1dbf35dc45129c86900916c4bfc8bfbf0065f0a01c751

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