Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff73cbbd5051384a…

MALICIOUS

PDF

48.0 KB Created: 2021-06-03 23:16:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6a902b8b134c7866738c3e1e1f06bcf4 SHA-1: 81d5495a06930700d65168c53025b0140c554b09 SHA-256: ff73cbbd5051384a14f01c069b2d156d27573c998d4983473d3288aa07149fb6
200 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a known malicious URL. It also displays a fake CAPTCHA, intended to trick the user into interacting with the malicious link. The document body confirms the lure, referencing 'free coins' and providing the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-get-free-coins-in-coin-master-game-hack In PDF document text
    • https://library.kysm.edu.my/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/my-robux_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/near-tiktok-free-download_GM835599320.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/roblox-re_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005395.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5395 25316 bytes
SHA-256: 456cb6df235eb0024fb7d0e956b9587612c9c44a68faf93151875425c50a1a97
font_01_sfnt_off00008ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCF 3804 bytes
SHA-256: 0cb58281cee40c77618e7f719ba633dba5a23563884aeb508d523a8e8cf1667d
font_02_sfnt_off00009a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A10 17872 bytes
SHA-256: ea6dcb3ab890178a05547e3161835c8edeffae3732ad32b35eba99407f3e1bd5

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