Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd405324830e6cbe…

MALICIOUS

PDF

36.0 KB Created: 2021-05-25 07:00:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0548c2c347f61feef5f29e202aea559e SHA-1: 9fae38c8753cce4ccf01e976e09390958ae6d432 SHA-256: dd405324830e6cbe5b13c3faa21e4e01fa01cc20912068b0b12da96658f3c344
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, specifically advertising 'free generators' or 'game hacks' for popular games. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users through social engineering and redirect them to malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/406889139/free-coin-coin-master-game-hack In PDF document text
    • http://nitetpl3.com/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/roblox-gang_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://nitetpl3.com/images/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://nitetpl3.com/images/20210-free-spin-links-for-coin-master_GM406889139.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_off0000351b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x351B 24556 bytes
SHA-256: 6f83719b3fb511d6ce33cbee9629e83a1821e7ea50d235a6fe872c046b245f5e
font_01_sfnt_off00006d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3E 17712 bytes
SHA-256: effefb876c7a76aa063811ff0160e46fb8a90dd5507c6c48ef6fa39823ab5c8c

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