Malicious PDF — malware analysis report

Static analysis result for SHA-256 949ec2f3b51d1dd3…

MALICIOUS

PDF

38.8 KB Created: 2021-05-22 09:22:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4b69db596ac2b75d1422861fc2836e45 SHA-1: d1e3f856ba0ceb3521cb0163866d071760935ca6 SHA-256: 949ec2f3b51d1dd3a195ca8cbb6c174dd7d58db3222afff99196a64ec8241af8
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a link. This link redirects to malicious infrastructure, specifically a generator/game hack site, which is a common social engineering tactic. The document also contains multiple embedded URLs pointing to other potentially malicious PDF files, suggesting a downloader or redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/835599320/free-tiktok-fans-and-likes-game-hack In PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/aternos-free-minecraft-server_GM479516143.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_002_off00003273.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3273 25040 bytes
SHA-256: ff181f26751403ecbbf00687e0a909272728ff4e9337c4945db7d1cb016848ef
font_01_sfnt_off00006c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9D 3124 bytes
SHA-256: d6dd29adb69da7f9a23a5e3791282a61e2f811794f560a0c409c8747766d9102
font_02_sfnt_off00007756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7756 17856 bytes
SHA-256: 73670565195d1614abdebf4593265cc7a8d42409e9f7addc13b51e248eeb6564

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