Malicious PDF — malware analysis report

Static analysis result for SHA-256 b579d4ad9715c3b3…

MALICIOUS

PDF

43.3 KB Created: 2021-05-15 09:35:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0e99f9909e927932b7ccdf8d7e881bd6 SHA-1: c8fcd346cdf4c59049950edf879290695e383c5f SHA-256: b579d4ad9715c3b32f132d7f58c01369313021097d92e3dc7085e2778559e366
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free Robux' and 'game hacks'. The document body and heuristics confirm the intent is to lure users to click these links, which lead to malicious infrastructure. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-email-game-hack In PDF document text
    • http://quatangthienthan.com/images/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/app-master_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-get-free-robux-easy_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_003_off00004795.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4795 27236 bytes
SHA-256: bb2d66a37525a5c95b71e4fa852cfccf58b5a662549159feff2f69abbe572d6b
font_01_sfnt_off000085b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B7 18696 bytes
SHA-256: c87d8ac99bb6295dbf621d5ce4d48bdb441e63486eed0d538621ad0af406e722

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