Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44c3bc79032ef5b…

MALICIOUS

PDF

49.0 KB Created: 2021-05-14 00:01:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c4a63b557c94a93ab031880e4cc89388 SHA-1: fa98afa731aa159d90b2385f6c967f5e3d34f7d4 SHA-256: d44c3bc79032ef5bc02550270e0151399483503240a8c750596f59a5c011a0ce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free Robux generator" and "game hack", directing users to a known malicious redirector URL. This indicates a phishing or scam attempt, likely to lead users to further malicious sites or downloads. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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 https://netcdn.xyz/app/431946152/free-robux-generator-for-roblox-2021-game-hack In PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/robux-codes_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.pswpallets.com/uploaded_files/userfiles/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C6D 30188 bytes
SHA-256: b8db5e47c5cf9c29e6e9a77bfa183608b6d5d7415d7bbfec9a8df5fb6cc39690
font_01_sfnt_off00009095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9095 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_02_sfnt_off00009ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA8 18820 bytes
SHA-256: ebe9c90542e8fe2fea15c90130dc88571bff9717049b6ef0e566bae53a322baf

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