Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ca9cdcf0010c35…

MALICIOUS

PDF

44.3 KB Created: 2021-06-09 15:19:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fbfa8a7b989605904f02128d04d87e55 SHA-1: fc8453c99528e729f12b544d57bf4aa479d677e9 SHA-256: 87ca9cdcf0010c35b3a5da7e462477801f2608bcc15c1ec1d129b1e4a81d6e38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "game hacks" and "free generators". The embedded URLs and heuristic firings strongly indicate a lure to a malicious site, likely for further payload delivery or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-free-robux-for-wiewers-game-hack In PDF document text
    • http://bgnails.nl/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-do-you-getv-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/rbxnow-gg-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/group-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/can-you-get-free-robux-on-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
stream_004_off00005005.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5005 24956 bytes
SHA-256: d1e58eef6b91ca61f0adf18b670b099442dbf259f671a341770698cb4c60df54
font_01_sfnt_off00008990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8990 18568 bytes
SHA-256: 8bc8db61dc731ff4e9a785dc84bc1b2fbb50ddc7eaee6864a5d22ca1e75e1162

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