Malicious PDF — malware analysis report

Static analysis result for SHA-256 261806b8d00eddc8…

MALICIOUS

PDF

33.4 KB Created: 2021-06-22 04:38:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5c71514c99703056a3e3309c8c2b0062 SHA-1: 3124e77c5204a81604072a8b8dcf8c8c5db19966 SHA-256: 261806b8d00eddc818bd1f5376e905969d39cd4dfdac24b7a9adee837cc3ba50
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, http://netcdn.co/app/431946152/give-you-free-robux-game-hack, which is presented as a 'free generator / game hack'. This lure is designed to trick users into clicking the link, likely leading to further malicious content or downloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/give-you-free-robux-game-hack In PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-nation-hack_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-any-roblox-item-for-free_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-play-a-game-that-cost-robux-free_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-roblox-game-passes-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/dantdm-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-roblox-accounts-with-robux-that-work-not-banned_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
font_00_sfnt_off00002d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D68 21712 bytes
SHA-256: f971c0410045706801a2373e42af5cc1333e56f5a04373fe711fa62346558cc2
font_01_sfnt_off00005d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D32 19112 bytes
SHA-256: 7bf3ac4dfcb70216b8a2b9559ee88ac2228da55bcea2ecdabc71f98af14d0948