Malicious PDF — malware analysis report

Static analysis result for SHA-256 357363fb158b52c3…

MALICIOUS

PDF

34.1 KB Created: 2021-06-21 15:37:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa3b86bc4eb42f40a62da256f908ea22 SHA-1: 2dde695339c61982e33d54d3b1ef8017d18f8b4f SHA-256: 357363fb158b52c32ef8e577f12ca8fd764b81f9e0ed7482ae7096474a71af04
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector, disguised as a lure for game hacks and free currency. The document body and heuristics indicate a social engineering tactic to trick users into visiting the malicious URL, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/codes-to-get-free-robux-game-hack In PDF document text
    • https://cuc.ac.cr/userfiles/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-roblox-script-exector-september-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-money-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-girl_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/www-robux-us_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/master-coin-free_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-march-2021_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_off00002eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAC 22312 bytes
SHA-256: 9508ecfb1af4d8b8aa1e11d53fb2add71ca756d4c8c6d03b4e10dafe8f9a9159
font_01_sfnt_off0000606c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606C 18996 bytes
SHA-256: dae15d86f19837a25368e9980f7c547d0fc236531c79ecd70a0408dcd8fbc7fb

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