Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d61c51e22dd65d…

MALICIOUS

PDF

40.7 KB Created: 2021-04-25 03:37:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c061277933d430751093a6c4d13a657b SHA-1: 6f11d6b20d81af530785aa0375452d909f8c0ad8 SHA-256: 98d61c51e22dd65d82b743098fbcdec3fa1c7aa85b79bdffa624fc2d59fb8002
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and free currency, directing users to a known malicious redirector. The document body and embedded URLs reinforce this lure, suggesting an attempt to trick users into visiting malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/431946152/free-robux-card-generator-2021-game-hack In PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/roblox-meep-city-money-hack.pdfIn 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/how-to-free-someone-in-prison-life-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-roblox-bear-mask-wear.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-use-a-script-hack-roblox-game.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/how-to-hack-jailbreak-roblox-2021.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/inject-hack-roblox-free-robux.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-com-au.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/best-star-wars-maps-free-modeled-roblox.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_off00003f06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F06 26796 bytes
SHA-256: 1792114718eff77ac7a22b1a0bd7c7e49448ad7e1970d31e2cffd204f510653a
font_01_sfnt_off00007b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B33 18920 bytes
SHA-256: 7b297b02a4c24d2f2405c47b9a7ee7c436fcf86a29e0ca86e638bef460bc7dc2

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