Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf6349565212880…

MALICIOUS

PDF

48.0 KB Created: 2021-06-08 17:24:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 61a963169028264cdf5d5c6c3421a1b4 SHA-1: 19cfd2a7b1de0a6e3864d643e69502410537bd7b SHA-256: 8bf6349565212880d2d4404c39b44e1937c59366ad883232289914baaf84da04
260 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links. The document contains numerous links to redirectors and SEO-optimized PDF files, suggesting a campaign to drive traffic to potentially malicious sites or distribute further malware. The presence of embedded JavaScript, though not directly executed by the PDF viewer, indicates a potential for more complex malicious actions if the user is tricked into opening a linked document or executing a script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-cheat-us-mobile-game-hack In PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/hacks-on-roblox-grand-theft-auto_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/free-tickets-generator-roblox_GM431946152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005160.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5160 24788 bytes
SHA-256: 6762691bb2b402fa605026e31003adcb9c24d1550c1cfad28e8c20524cdee2e4
font_01_sfnt_off00008a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5C 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000976d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x976D 18784 bytes
SHA-256: 1f410bf038df7c4eafbbf8e72beb82fc0f12d45e263c85aba02a7613aa4539b1

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