Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ba4fe2e8304e3a…

MALICIOUS

PDF

35.3 KB Created: 2021-07-09 15:09:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7d06397ee0da7c7d19511b599b9aa426 SHA-1: 32b11d618c8db8b753a8fab1594f6665c40050e4 SHA-256: 67ba4fe2e8304e3a0403a518fd61178754b9f380424a35477c995fa3b8a75ea1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/hack-coin-master-android-game-hack, which is disguised as a game hack generator. This indicates a likely attempt to lure users into clicking malicious links, potentially leading to further exploitation or credential harvesting. The presence of embedded URLs and a visual download button lure reinforces this malicious intent.

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/hack-coin-master-android-game-hack In PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/como-hackear-vehicle-simulator-roblox-para-tener-12000000_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/robux-hack-without-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-renders-free_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-bypass-roblox-with-cheat-engine-66_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/a-roblox-hack-to-get-all-money-in-jailbreak_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/secret-robux-hack-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-download-roblox-siwiwwugfeefef3_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-counter-blox-hacks-2021-download_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-robux-quick-easy-cheat_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
font_00_sfnt_off00003379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3379 23196 bytes
SHA-256: 56002c4f0c5dec3f6c8ce2c722d1750a3ce7f4f71b2e84fe2aa987aa36528b37
font_01_sfnt_off0000678e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x678E 18180 bytes
SHA-256: f516f1a9de2d2e1cf94b8286abc4ceba1cdd398d14570858e1a608875a568c2b

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