Malicious PDF — malware analysis report

Static analysis result for SHA-256 4beb5b9956ac0702…

MALICIOUS

PDF

37.7 KB Created: 2021-05-21 05:23:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bfb271823770259288370438cfae90e1 SHA-1: 39a27392a43f339176d99410ee52d41bc10958c1 SHA-256: 4beb5b9956ac0702e1ba1304bc8177e1c2e1622a8961a1f5c9b255c6817e24d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that lead to malicious redirectors, masquerading as generators for game hacks and followers. These redirectors, in turn, point to other PDFs hosted on a separate domain, continuing the lure chain for Robux and Roblox account hacking. The ML classifier also flagged this PDF as malicious, supporting the observed malicious redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/835599320/free-tiktok-followers-without-human-verification-2021-game-hack In PDF document text
    • http://ferienwohnung-walker.de/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/get-me-robux_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/how-to-get-free-robux-app_GM431946152.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_002_off00003192.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3192 27644 bytes
SHA-256: f545e865c1027861cf4b6b000d3826ecaa64f446d101cef7ee3d5d4fe9aca069
font_01_sfnt_off00006f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F69 19224 bytes
SHA-256: aa1f0f64d1546b8f506430e93d2d6ced76792d6427f3cc22d6ed4bca0b548cde

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