Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc64905425923bb…

MALICIOUS

PDF

42.7 KB Created: 2021-05-12 14:31:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1bbfd98a21a3c41d7a0c304a85186d3c SHA-1: 097350af64f25cdfa7c5e64f94706d232becf26f SHA-256: 3fc64905425923bbc414d8aa28d184021ef4bf7092db39f19046d901b4f4e277
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at `https://netcdn.xyz/app/431946152/roblox-arsenal-hack-game-hack`. This link is presented as a lure for game hacks, and the document body contains obfuscated text and additional links to similar content. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

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/roblox-arsenal-hack-game-hack In PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-do-i-get-free-robux_GM431946152.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_off00004a3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3A 25248 bytes
SHA-256: fc3fb5ba891829abad302970863c51d0777fd2761850804b90e316069efb6acf
font_01_sfnt_off000084de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DE 18184 bytes
SHA-256: 950cb6c94e3217e8d5edf097fa87367098c5f84c9f1c4255a513a3effc23c56b

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