Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b7b5f680e824b3…

MALICIOUS

PDF

46.4 KB Created: 2021-05-12 06:08:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f9af7376d93220a64ef7c20913af65ea SHA-1: 9b9034b56b50b1e189daa2c606bfcc9f50970c47 SHA-256: 23b7b5f680e824b3de72637a0e926a01e9d3e2f6d8803698cd526a83fcbdc698
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector at `https://netcdn.xyz/app/431946152/instantrobux-game-hack`. The document body and heuristics indicate a lure related to obtaining free game currency or hacks, likely to deceive users into visiting these malicious sites. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/instantrobux-game-hack In PDF document text
    • http://www.myresidence.lu/userfiles/files/robux-gainer_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DA 26860 bytes
SHA-256: b52720f8449673a4f33a64b8a0c0cce2ffc517383c2ae45c3ddff60ee083d345
font_01_sfnt_off00008878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8878 3016 bytes
SHA-256: 4c3e2db5174821787a4569c9da4979555510caebd15fb9cea35573c139e242bd
font_02_sfnt_off000092db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92DB 18184 bytes
SHA-256: 4d77632c85c001e266779ad9698d54220e11b78bd17d8b0f085f3dc4dd17180b

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