Malicious PDF — malware analysis report

Static analysis result for SHA-256 15490a17b7c13a8f…

MALICIOUS

PDF

34.9 KB Created: 2021-07-10 01:50:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e1d4dd2495949e9114db696e3b24a006 SHA-1: 6d4290e803482ea69079746a586dfa44d3b85c52 SHA-256: 15490a17b7c13a8fa5a0a2872bc78bcb2e3126c2205ad2a8266ce81442ed033e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into downloading free game currency or hacks. The primary link, http://netcdn.tw/app/431946152/win-free-robux-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at driving traffic to potentially malicious sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/win-free-robux-game-hack In PDF document text
    • http://global-brand.net/userfiles/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-roblox-bear-mask-wear_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-hack-tool-download-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-com-free-skin_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/robux-hack_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/cheat-qui-dupli-sur-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/soros-roblox-hacks-pastebin_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-unused-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free4now-info-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-how-to-get-japan-sushi-card-free_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_off00003061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3061 22788 bytes
SHA-256: aafa3abf421782d74b99a64f795c64fa60700965eea78d395cfb87cdf249ea59
font_01_sfnt_off0000637f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 19036 bytes
SHA-256: 866c875b7ada575fda7e0b2d16b4e3d455f2c28d19dc14b305271f934871ca62

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