Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a822c54497487d9…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 10:55:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 97717a6f172f8609c536e31239b462c0 SHA-1: 42ea1b9c6b7f5a31a8d2b5745b01bc5e7b5dbd33 SHA-256: 5a822c54497487d959673a9f73b2d30d17056e4bdb6022d48ef38caa41533bae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

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/get-free-robux-info-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id/repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/hacks-para-roblox-tycoon_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/pubg-uc-buy-in-pakistan-jazz-cash_GM1330123889.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/roblox-ghost-simulator-cheat_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/free-robux-generator-no-human-verification-or-offers_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/fishing-glitch-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/tiktok-free-auto-views_GM835599320.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-2021_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_off00002d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9C 22828 bytes
SHA-256: f063b638c656740dbfe73ae4ca1f067328a28fc1fddf7d75651fcee8a3e373d7
font_01_sfnt_off000060c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C8 18820 bytes
SHA-256: 8535eaa3a36812cf4d83c53ed5505d1914af83630ad42aec0f482fa3bbee313b

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