Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7632f5682c13c93…

MALICIOUS

PDF

35.8 KB Created: 2021-07-03 19:38:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 80ca5c0eaf638115b4d5603ee0e66b51 SHA-1: b2f7ef6042ed18e7c339b55f701abb28389791d1 SHA-256: c7632f5682c13c93f8d9c3159ffe0cfde55f3563b6ad81b217735b2ed6cc3395
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as game hacks and free currency generators. The primary lure is 'free spins coin master', directing users to 'http://netcdn.tw/app/406889139/free-spins-coin-master-october-13-2021-game-hack'. This infrastructure likely serves as a gateway to deliver further malicious payloads or phishing content.

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/free-spins-coin-master-october-13-2021-game-hack In PDF document text
    • https://tena-g.hr/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-free-robux-generator-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/hacks-to-the-game-on-roblox-cadet-promotion-course_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-com-free-clothes_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-roblox-gift-card-code-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/speed-hack-roblox-wild-revolvers-download_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-free-t-shirt-on-sale_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-free-vip-server-jailbreak_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/minecraft-free-download-mac_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_off00003394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3394 22996 bytes
SHA-256: ab5b882ff7590568696637fde88533dd2b0aaabdbe28ce94048394394a54e9e2
font_01_sfnt_off0000674d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674D 18908 bytes
SHA-256: 5f1d4495c97bce4e07ce5b2e9deba33a1b004efb7bf930514dbc796c23275dbc

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