Malicious PDF — malware analysis report

Static analysis result for SHA-256 39af5a96f19b934e…

MALICIOUS

PDF

40.6 KB Created: 2021-04-25 16:15:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6e2e16839e1e32fe6711377db53c2640 SHA-1: c8870b60375f4d03ee8924f8b2742523b9a02ab5 SHA-256: 39af5a96f19b934ec5f99b9a28accc2a97d91b1726bda6b661407e6cf6b61bb8
160 Risk Score

Malware Insights

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

This PDF document employs a game hack lure to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts multiple other malicious PDFs. The document's content and embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/speed-hack-roblox-download-2021-game-hack In PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-powergrip-gauntlet-in-parkour-roblox-free.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-how-to-get-free-robux-glitch.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/fly-hack-roblox-2021.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-granny-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification-real.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hacks-for-roblox-ninja-legends.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/get-free-robux-on-roblox-with-coputer.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-jailbreak-hacks-dll.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-mod-menu-for-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-a-free-gift-card-on-roblox.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_003_off0000404a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x404A 24912 bytes
SHA-256: cb90de915141e212ec92619a4a8e4680e7773a0232d804d4e6c831c96136c0dd
font_01_sfnt_off000079c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C6 19264 bytes
SHA-256: 9f4f96ada42604ee8fa1e2c306b8252304a8deb5af13c34f00ccd3f5fc039a67

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