Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d6606b73223456…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 19:09:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b90d32c73ba7f60590f6ff03ce32b474 SHA-1: 79912e4032b518621fc3b498476d5ba35910d788 SHA-256: f3d6606b73223456bc2624e5e594d1e4954ec2920f5015ecb1fbca752f9279f5
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 trick users into clicking a malicious link, disguised as a game hack generator. The embedded URL, https://netcdn.online/app/406889139/coin-master-hack-version-download-2021-android-game-hack, is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to facilitate initial access via social engineering, likely leading to further payload delivery.

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/coin-master-hack-version-download-2021-android-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/tiktok-free-verified_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-iphone_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
stream_004_off00004fc5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FC5 24516 bytes
SHA-256: 11961f3d1b652483065992c14dfa961dab2a40e62a613f8a4e3b6c2ec954309c
font_01_sfnt_off000086b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B2 18832 bytes
SHA-256: cd0ec0ee3d6d2e78cc0295f59590dfb899d6956e54506a4c66f347aa13d8e697

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