Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1c6cc4efec50c6…

MALICIOUS

PDF

43.6 KB Created: 2021-05-12 11:30:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d35100274f41fc2ece46a06ac8d85934 SHA-1: 58444e5531bc12620d856701561b7f68991c082a SHA-256: ac1c6cc4efec50c6674398b7f7d87ffff5b24fdd16fc5c7563a1d16910582dc2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'free Robux' and a link to a known malicious redirector. The document body, though heavily obfuscated, contains references to 'free Robux' and URLs that are likely part of a scam or malware distribution chain. The ML classifier also flagged this PDF as malicious.

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-instantly-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/spin-coin_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/rbx-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-links-coin-master_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_off00004bac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BAC 26536 bytes
SHA-256: ee4f901ac3497f0d4bee35c87ab68c7b50ff96f69e7d2b7aa89b7279bbaa1a31
font_01_sfnt_off000086e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E2 18600 bytes
SHA-256: eeb00711cf2e5591db958639ea5d908a8ba1b5c4404aa75c69e8a5349c023cb9

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