Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd31526caa9ba7b…

MALICIOUS

PDF

36.3 KB Created: 2021-05-22 11:06:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cb66a8569e8078d3e50a0655c4d7728d SHA-1: 7294208dbc399ece2ba840a96c66b5cfc80a78e2 SHA-256: 8cd31526caa9ba7b37692a90da5e8400d2e067b0bc6f0a3723e24f67148d5a09
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, disguised as "free generator / game hack" lures and fake CAPTCHA prompts. These links, such as 'https://netcdn.xyz/app/835599320/free-tiktok-accounts-with-followers-game-hack', are designed to trick users into downloading further malicious content. The document body also contains embedded URLs pointing to other PDF files hosted on 'niceviaapia.com.br', likely part of a download chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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-accounts-with-followers-game-hack In PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-hax_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/ways-to-get-free-robux_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_002_off00003210.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3210 25704 bytes
SHA-256: c3463b4f20004e7cc94079e832e7eaae08aebe2b3c6ef2eb2f1946bf396d1aa7
font_01_sfnt_off00006cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDF 18200 bytes
SHA-256: 00ff3188f7c2cc6f3bb1e48311a72fd536e799d3f1f3caf1b59355958851fd7e

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