Malicious PDF — malware analysis report

Static analysis result for SHA-256 127d091fc953306e…

MALICIOUS

PDF

34.5 KB Created: 2021-06-19 00:45:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 90b7181ff67246767f2e2c5b87a7869c SHA-1: 42037d404a2a5a493ad6073bab7f8bd8b9d0b01a SHA-256: 127d091fc953306eb4f4f6b7dbd41b33eb101d1fd8269d9f500269c606c77d0a
168 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a critical heuristic firing indicates it links to a malicious redirector disguised as a game hack generator. The document body reinforces this by containing the same lure text and URLs. This suggests the PDF is designed to exploit user interest in free game items to redirect them to potentially malicious sites, likely to download further malware or engage in phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://netcdn.co/app/431946152/hacks-for-roblox-legit-free-robux-game-hack In PDF document text
    • https://sundae.co.th/js/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/blackberry-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/20210-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3084 22124 bytes
SHA-256: 37c24e1590e6a0a26869e7669345133f78c8d97cea654ece697d9e2db476d366
font_01_sfnt_off00006195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 19184 bytes
SHA-256: de52a0f01671365ae76a5e736e09c1bd52ba0f97ded9c1945587a2f7da754dc5

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