Malicious PDF — malware analysis report

Static analysis result for SHA-256 5620ff89c06dd3e8…

MALICIOUS

PDF

46.8 KB Created: 2021-06-04 04:15:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e19aa11cd0136f2401692d1694aee871 SHA-1: 845a1c312c0e837f09bdd29396cb794aba27f693 SHA-256: 5620ff89c06dd3e81c170d95b79e5119408cad8a043788c9b0e3da02a3398643
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure designed to trick users into clicking a malicious link. This link redirects to a site offering 'free stuff on Roblox', which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious, and the presence of multiple redirector links indicates a high likelihood of malicious intent. No scripts were extracted, but the document's structure and embedded links strongly suggest it's a phishing or scam document.

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.online/app/431946152/cute-free-stuff-on-roblox-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-tiktok-followers-quora_GM835599320.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/moon-active-games_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/poke-coins-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/add-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/tiktok-free-bot_GM835599320.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
stream_004_off00005209.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5209 29996 bytes
SHA-256: 5eceda9794add6040f8605fac862122ccdec7616b7da08f2fa08826d4f44de75
font_01_sfnt_off000094d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D1 18192 bytes
SHA-256: a6b915e7016f468889ed3b93934f8cc43e4d030a5546ddc8b69dc33b37ef3c58

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