Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac825b76e58180c7…

MALICIOUS

PDF

33.7 KB Created: 2021-06-19 02:01:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 58fb1602a86c1fe6fb60bf29ebca6e31 SHA-1: 4907f97964c01807bacabf041a14243788b8badd SHA-256: ac825b76e58180c7452d1f88022aacec341044d005b49a2089a5a80a4fc4755d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures for popular games like Roblox and Coin Master. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are designed to trick users into downloading further malicious content or visiting phishing sites.

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/roblox-free-download-laptop-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-chill-cap-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-account-hacker-website_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/can-pokemon-go-free-evolve-after-trade_GM1094591345.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-generator-2021-june_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/cheat-roblox-phantom-force_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/cheat-roblox-lumber-tycoon-2-indonesia_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/proto-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/codes-for-skyscraper-tycoon-roblox-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE5 21808 bytes
SHA-256: 531e383429a9722f6c4d03fcd8177843eed264fb2d93f64f4e6b940fe098eeb8
font_01_sfnt_off00005d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D21 19436 bytes
SHA-256: 85e961fc27c9f080199aa42aa9f119572bd76b86c2c8102922cd5b5c86cbae0b

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