Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98f8b729ef65770…

MALICIOUS

PDF

33.4 KB Created: 2021-07-06 06:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 699ff1a1886a6478ba8391ce5d39e136 SHA-1: 4394684f709290c2ee85c30e0272441b4adfca86 SHA-256: c98f8b729ef6577096fea83028263d749a618ce91bbdd0f2f3d8be69ec879e71
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to malicious websites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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.tw/app/431946152/roblox-free-robux-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hack-para-assassin-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/google-site-roblox-hack-get-free-robux-right-now-online_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-today-twitter_GM406889139.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_off00002e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3A 21704 bytes
SHA-256: 805cf1a25b7b988b84a9f2ce0f95b68327a8d8be4ec1edce4fa8f1a92270bce0
font_01_sfnt_off00005e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2B 18788 bytes
SHA-256: 240f26960413d3375b32b54d3a16c3eb3bd7324ec8649811f17e0fe1da2802cb

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