Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a6b1a822986b75…

MALICIOUS

PDF

41.8 KB Created: 2021-05-16 10:45:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 33abc9bbaf09b6bcef981231cd9567cb SHA-1: 81839dc8f92abf7538d1959a065819b8d549c425 SHA-256: 90a6b1a822986b75786a23e5870e93d70b38dcae93a14b7f9b843e6045455bc9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.xyz/app/431946152/earn-robux-sites-game-hack. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites, likely for credential harvesting or further malware delivery.

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/earn-robux-sites-game-hack In PDF document text
    • https://www.brainpads.com/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/blox-fun-info_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/roblox-hax_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-earn-free-robux_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_off00004933.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4933 24248 bytes
SHA-256: 4f01946f5605808331e7405e4684c6b6d026dc8670820daf8c3b8e3eb596811e
font_01_sfnt_off0000809c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809C 18300 bytes
SHA-256: 9e3af24e52ef4cb9fc4b51a762cd65285bc4813e2d9c15cd1a5337b0fae4df73

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