Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4f27f9a8bdfa3a…

MALICIOUS

PDF

44.9 KB Created: 2021-06-08 22:09:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0975c91d64c045ec31f430710914f75e SHA-1: 6a64a829a0f6c088338ff03b7528761aa2f8951b SHA-256: 3f4f27f9a8bdfa3a8bc1439a9fd82d072275e58046710e1b145dea0ba950ee26
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, directing users to click a link that leads to a malicious redirector. This redirector, in turn, points to a URL associated with game hacks, likely as a pretext to download further malicious content. The ML classifier also flagged this PDF as malicious, supporting the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/how-to-hack-roblox-accounts-2021-unpatched-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/promo-code-free-robux_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_off00005185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5185 24164 bytes
SHA-256: 711af6b5a0e8135487c83e76540cc8d84f8a5929c340794c672297159726005e
font_01_sfnt_off00008881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8881 19696 bytes
SHA-256: 8730f356c3294a40ea1e1bbb48bd4ad5d1a779caab8e0ab4efa221dbebb57bb2

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