Malicious PDF — malware analysis report

Static analysis result for SHA-256 389b178f085f55c1…

MALICIOUS

PDF

41.1 KB Created: 2021-04-25 00:19:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f593c03b48ff0bafc3b8542d0b56cd08 SHA-1: ebf93e9789941ecd319f070af8e03906568120f7 SHA-256: 389b178f085f55c15310e8e935912ae763147176d4960c1fc32a56d7d0262cb4
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to what appears to be a malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body and heuristics indicate a social engineering lure, specifically a browser extension or update installation lure, combined with a visual download button. This suggests the primary goal is to trick the user into clicking the malicious link, likely leading to malware download or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/free-roblox-bear-mask-wear-game-hack In PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-hacked-accounts-for-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/como-hackear-robux-en-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-promo-codes-june-2021.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-limitless-free-robux-unpatched.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-roblox-chaser-codes.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/hack-para-zombie-rush-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/20210-robux-free.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-stuff-hack-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-roblox-builders-club-code-generator.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_003_off000041bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41BF 26288 bytes
SHA-256: 9b9a22704750aae61dc48df2c2d400dd12aea9317467283e33c0572f273323ab
font_01_sfnt_off00007dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBA 18740 bytes
SHA-256: 03c2f0b87fc1a749d4ada91aae021a3db7b5f53cf5385cfed0a25e0ab0d1a5be

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