Malicious PDF — malware analysis report

Static analysis result for SHA-256 92987a7bba0ce408…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 14:12:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c8dc686e6aba5a34345d4def8bfa24a5 SHA-1: 0ac36a59ff4d2a655f11529d28224dca815256a5 SHA-256: 92987a7bba0ce40894659578728d09c32fa67e8386844a38d1c21aa65c98a2a9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external sites, including a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-100-spin-game-hack. The document body and heuristics indicate a lure for free game generators or hacks, designed to trick users into clicking through a chain of links. This behaviour is consistent with a phishing or social engineering attack aimed at driving traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-100-spin-game-hack In PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/free-tiktok-views_GM835599320.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/cool-exploits-for-roblox-totaly-safe-and-free_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/free-robux-no-pass-or-survey_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/hacking-roblox-zombie_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/in-game-money-hack-roblox_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/how-to-check-if-someone-in-roblox-is-hacking_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/roblox-hack-robux-free-deutsch_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/minecraft-login-free_GM479516143.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/roblox-jump-hack-2021_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/hacks-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_off00003083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3083 23576 bytes
SHA-256: 5f16de9c294f1f892d0d90070630d63b588c8c9dc48951f188f62253db2021ee
font_01_sfnt_off00006522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 18288 bytes
SHA-256: e7eedd1d7f2d1bddccca1a35bcbf42f4aa03d5dcfedc55eaf08a1a6e6f1d261c

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