Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9cb85ee878dec9…

MALICIOUS

PDF

43.8 KB Created: 2021-04-25 05:04:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7be25627f40534e62bf391c5c24d0b83 SHA-1: 07b06d3ed0031ec310f34cc4ec8ca8e572a6c098 SHA-256: 3e9cb85ee878dec97f35baafa0344b7f18b95e359be9e57bb3e3887b8c2f7fea
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically a "free Robux generator / game hack" lure. The primary malicious URL is https://netcdn.xyz/app/431946152/roblox-code-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit vulnerabilities or trick users into navigating to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/431946152/roblox-code-free-robux-game-hack In PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/moon-tycoon-side-roblox-hacks.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-free-money-in-the-plaza-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-games-that-cost-money-for-free-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/is-roblox-premium-free.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-sell-clothes-for-free-on-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-hack-no-download-2021.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/best-star-wars-maps-free-modeled-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-free-admin-on-roblox-2021.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-roblox-builders-club-code-generator.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/the-plaza-roblox-money-cheat.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_003_off0000403b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x403B 26828 bytes
SHA-256: 6bb5b654a65b5721655175dd428ab48d77d98037582e3ec73ac2cdbed842577c
font_01_sfnt_off00007e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3B 3312 bytes
SHA-256: 40bd8eebcb3a0d68a8646f1930e84f30a44bfa48525263c6c528f0bc1e9c1677
font_02_sfnt_off0000898b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x898B 18260 bytes
SHA-256: 2ca0915210f79b63dc158a66835066204b3250b1d08244dcab1c1463ecbc3911

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