Malicious PDF — malware analysis report

Static analysis result for SHA-256 43992e6258fd744e…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 05:40:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 139f52443d604d89af6c88268c736f5f SHA-1: 38c88299cdf84694945fd48bb888d7929c5b7811 SHA-256: 43992e6258fd744e6bedb5c6126f34ac6a72244eddae7b052148837ca00652dc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'free Robux' or game hacks. The primary lure URL is http://netcdn.tw/app/431946152/how-can-i-get-free-robux-game-hack, which is flagged as malicious. The document body and embedded URLs reinforce this theme, suggesting a phishing or scam attempt to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious redirection attack.

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/431946152/how-can-i-get-free-robux-game-hack In PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/counter-blox-roblox-offensive-wall-hack_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/roblox-bee-swarm-simulator-honey-hack-download_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/heists-free-roblox-demo_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/minecraft-login-free_GM479516143.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-no-cheats_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-roblox-like-bot_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/fbchampion_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-robux-if-join-group_GM431946152.pdfIn PDF document text
    • https://www.trendsfashionusa.com/uploaded_files/userfiles/files/free-spins-on-coin-master-iphone_GM406889139.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_off00002f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F79 22324 bytes
SHA-256: 2e20ac70b103164d31058e28137f3e3772bbb7c11d6b99dbb34901984dba56ef
font_01_sfnt_off00006124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 18984 bytes
SHA-256: 88d69eb3e5aacbb9415b7e9d5cab519469ee3fdfdf18acc61836835876a3bab2

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