Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b55afd3526c6c0…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 13:25:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 17f2d281a43800c0f00aedbf18d8c20f SHA-1: 4843068f6d59ed2e7666c0664abdd4046a65c8ea SHA-256: c7b55afd3526c6c0998ce9ec3c8a11f9de9daf5da4fcbd27800f77664f054a56
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous links to external resources, including a known malicious redirector at http://netcdn.co/app/431946152/cute-roblox-clothes-free-game-hack. The document body and heuristics indicate a lure for free game hacks and currency, which is a common tactic for phishing or malware distribution. The extensive link farm suggests an attempt to manipulate search engine results or distribute a payload through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/cute-roblox-clothes-free-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-no-hacks-glitches-or-troll_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-robux-codes-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/everythings-free-roblox-mm2-uncopylocked_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-when-i-make-game-it-say-free-sign_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-clear-pants_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/jailbreak-roblox-cheat-may-20-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-to-hack-accounts_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-robux-generator-v131-wwwwehackcom_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-verification-no-download-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_off00003145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3145 22476 bytes
SHA-256: 0e09f75d809aa304408ba7d76fa1a3974cbf34db78d720861f76071e88dd8291
font_01_sfnt_off00006337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 19060 bytes
SHA-256: 415d181f6230df427f33dd1395de5456cc68f0ebbff7236a713b3ab48e58982b

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