Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d2f21e4d389302…

MALICIOUS

PDF

43.5 KB Created: 2021-06-04 04:47:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 109f58ac7b7e4386bdc98065c17b2df5 SHA-1: 474972faa85be4c8ec64476113b6bfff7b0cbbdb SHA-256: 76d2f21e4d3893020608d1c7dc08caa613ffec655b9f3487f10d29b2a7629ed4
200 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 deceive users into interacting with a malicious link. The link redirects to a known malicious infrastructure, likely to download a second-stage payload or lead the user to a phishing page. No scripts were extracted, but the PDF structure and heuristics strongly indicate a malicious redirector workflow.

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.online/app/406889139/2021-free-spins-coin-master-link-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/simplysarc_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/pokemon-go-free-walk-hack_GM1094591345.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/pokemon-go-free-100-iv-cp-list_GM1094591345.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/is-roblox-free-on-xbox-1_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
stream_004_off00004f51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F51 24244 bytes
SHA-256: 5652e3704fd341b19c3e72daea326e5b9b8b0ad8ca6ca4a472d7d5a65afb1f60
font_01_sfnt_off000086c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C0 18456 bytes
SHA-256: a76936ec484ac031b8c5f7bd82bd0b34adbabb4d9e9d5cccdc9978d26973b99a

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