Malicious PDF — malware analysis report

Static analysis result for SHA-256 7032bf52dd1e554b…

MALICIOUS

PDF

36.5 KB Created: 2021-07-04 08:03:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 21fc7df34571ea4820d00b3a01780be9 SHA-1: 01fac5b4c1519d4ab7c951943492dc4db2fc2ef0 SHA-256: 7032bf52dd1e554b102bc5bd64c7657a77c8e5adf0b54439e826c7bbf008ca9d
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/406889139/coin-master-daily-gift-free-spins-and-coins-link-today-game-hack. This redirector likely serves as a gateway to deliver further malicious content or phishing pages. The document body and heuristics indicate a lure related to game hacks and free currency, a common tactic for social engineering.

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-daily-gift-free-spins-and-coins-link-today-game-hack In PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/hack-para-tener-dinero-infinito-en-roblox_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-no-survey_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/how-to-download-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/hack-dowloads-robux_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/robux-download_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/free-robux-no-anything_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/quickest-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/google-music-roblox-hack_GM431946152.pdfIn PDF document text
    • https://zustsearch.com/uploaded_files/userfiles/files/how-to-hack-avatar-the-last-airbender-roblox_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_off0000358d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x358D 23268 bytes
SHA-256: 48a46fa1e8cd9f8673f5b793a52079f2d3a7bfb48b0287b1a0262586b29a78c1
font_01_sfnt_off000069f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F7 18940 bytes
SHA-256: 96a4a49a7531a9ada17fed0b4523f7a179851a2b327f16cfa1a43d363797840f

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