Malicious PDF — malware analysis report

Static analysis result for SHA-256 55842f3b8db021f7…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 20:04:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ba911bd5ab14044753527096e60cdb6f SHA-1: f62004281e3b8295eb8886a486cb0207481d3a57 SHA-256: 55842f3b8db021f7cd154c97389b4c2cd4a5cd3184e4aa2d0ebf1096ef457caa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-heaven-free-spins-today-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-heaven-free-spins-today-game-hack In PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-weapon-simolator-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-items-that-you-can-get-for-free-right-now_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-bypass-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/blue-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-genuratewr-no-survay_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-camera-plugin-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-keyloggers-v3rmillion_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-bedrock-server-hosting-free_GM479516143.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_off000033c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C9 22704 bytes
SHA-256: fe92411c41e683539cda29fac3f5218393137d5550adc7677bdb7cb6b5602cc2
font_01_sfnt_off00006697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 18640 bytes
SHA-256: 3d9153b17c01349321dbf9895197e00a389ef43fe3f4ac06fe2a253dcac379fc

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