Malicious PDF — malware analysis report

Static analysis result for SHA-256 651311667e77bb82…

MALICIOUS

PDF

41.5 KB Created: 2021-05-18 04:23:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 628e57cf33b30e9388a1ceb7714c9e36 SHA-1: 37e676cdf3519dc4d127959b3e8e6879ecef1ccc SHA-256: 651311667e77bb821094e97c8b4fb30aec5a43cb7c133a2c5bd7ac3edd6f86da
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux codes' and 'game hacks'. The primary malicious URL identified is https://netcdn.xyz/app/431946152/real-free-robux-codes-game-hack. The document body, though heavily obfuscated, contains references to these lures and other URLs that appear to be part of the same campaign. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/real-free-robux-codes-game-hack In PDF document text
    • http://aessentia.com/images/play-coin-master_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • http://aessentia.com/images/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://aessentia.com/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://aessentia.com/images/mcpe-master-unlimited-coins-free-download_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_003_off000046d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46D6 25028 bytes
SHA-256: 5e6a07822f19ec21f93e5b89c00c7340f5ed672cdd7145e88cc9175b15515482
font_01_sfnt_off00007f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 18492 bytes
SHA-256: 6ff68d48ac5036b960fd78490347d8f271b820cb13d1967b9212c8abd8834c8c

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