Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c735b6e4c2d3e6…

MALICIOUS

PDF

41.7 KB Created: 2021-04-26 00:37:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 419e972b20301341091879d7bc8ac1e0 SHA-1: 53d79550f099a8aa2c21ceda7bd5b1da1fe1b0d6 SHA-256: 98c735b6e4c2d3e677b7599d47aae1aa26cbdb0bef9796c0873f53649ea8ea39
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector, disguised with lures related to 'free Robux' and 'game hacks'. The document body and embedded links suggest an attempt to lure users to click through to potentially malicious content or download further payloads. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/free-robux-games-that-work-sepember-2021-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-use-free-models-on-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/get-free-robux-by-watching-ads.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hack-free-robux-2021.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-griffin-code-roblox-adopt.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-a-account-password-on-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/ads-for-roblox-games-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/2021-free-robux-hacks.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/cool-exploits-for-roblox-totaly-safe-and-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-limited-in-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-promo-codes20219-for-roblox.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
stream_003_off00004278.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4278 25188 bytes
SHA-256: a2f7540d96e5f23b4e1592127dd4d30637f824ef30f002ebba801810f87365f5
font_01_sfnt_off00007cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF8 19716 bytes
SHA-256: cb970142357638ae70d56342ee4e554572630b08506d5e6565e49e540182232e

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