Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff0357eeeba90dc…

MALICIOUS

PDF

47.9 KB Created: 2021-05-18 01:03:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c9ac6a773a78d43af558c36871324f33 SHA-1: 6a61bb0a9a77374f49819808222f1ef360cdc8ae SHA-256: fff0357eeeba90dcdea093d890e4c21fd674d5fe35d7c887535157054862c018
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free items, such as 'Claim Free Robux'. These links lead to redirectors and other PDFs hosted on IP addresses, indicating a likely attempt to lure users to malicious sites. The presence of numerous SEO-optimized PDF links suggests a link farm designed to attract traffic and potentially distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/claim-free-robux-game-hack In PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-free-online-game_GM406889139.pdfPDF link annotation
    • http://217.165.206.12/userfiles/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/how-to-win-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
font_00_sfnt_off00004a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A85 28376 bytes
SHA-256: b36f193a1b49e91678c11ab02930932a6a881869ab5fc53fd5d59b79f3a97f03
font_01_sfnt_off00008df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF8 2872 bytes
SHA-256: 5a38050e56bfed6ba013c4835499ae05f4b57b22e606c9172dd4bc2ae7fd1207
font_02_sfnt_off000097b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B3 18696 bytes
SHA-256: 5cf9f9319346d61d0cee7eea738a99b5b91b4687cc89c43f6f5509699f250cff

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