Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc87653ce21fd17d…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 10:24:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b375bc1f4b4781d51da2594da13a2029 SHA-1: 3287b082686ca0419214dc334da439d2cd1582a9 SHA-256: dc87653ce21fd17d524a0ea327fe9c7c38b8deff0e72de18910dd72c17e4e9c8
200 Risk Score

Malware Insights

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

The PDF document contains a lure for game hacks and displays a fake CAPTCHA to trick the user into clicking a link. This link, https://netcdn.tw/app/431946152/roblox-stella-exploit-free-game-hack, leads to a known malicious redirector infrastructure. The document's structure and embedded URLs suggest it is designed to facilitate the download of a second-stage payload, likely through exploitation of a client vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/roblox-stella-exploit-free-game-hack In PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/hacks-for-arsenal-roblox-mega_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-cheats-pris_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/free-robux-roblox-com-mobile4free24_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/how-to-get-free-bloxburg-roblox_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-dubliezieren-hack_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/free-alts-roblox_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-cheat-robux-deutsch_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-welcome-to-bloxburg-money-hack-lua_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-com-cheats-for-money_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/roblox-adopt-me-money-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/free-cool-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.aubay.com/wp-content/uploads/fsqm-files/free-robux-gift-card-gieaway_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_off0000528d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x528D 28916 bytes
SHA-256: 2f641a47ad1ce4ba679dcedb1e5873a078fbe1d2a9d5490ffef77f2fffb82aa4
font_01_sfnt_off00009170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9170 18576 bytes
SHA-256: a756c685c2ae94d206c961b001ad1bd6c4749b669fed8d89e04de960530fd803

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