Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8116c1d2c5f5bba…

MALICIOUS

PDF

38.6 KB Created: 2021-05-13 22:04:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 39e066949915fb078e671e2b98626b85 SHA-1: 91ebd9e05d8e047b37fef030f68cca22aa89821a SHA-256: b8116c1d2c5f5bba7c376dacb9376a2cdb15720c566246ce26538ddbb104f1be
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a 'GAME_HACK_REDIRECT_LURE' and a 'MALICIOUS_REDIRECTOR_LINK', both pointing to the URL https://netcdn.xyz/app/431946152/how-to-make-free-robux-game-hack. The document body also contains this URL and phrases like 'How To Make Free Robux', indicating a scam or phishing attempt to trick users into clicking the malicious link. No scripts were extracted, but the overall pattern suggests a phishing lure for a malicious download.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/how-to-make-free-robux-game-hack In PDF document text
    • https://www.bandicam.comIn 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_off000032e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32E5 28516 bytes
SHA-256: b9052d3a760ab70c56c8f081aa80564043879c5eec2ec53872f9f929e3227d55
font_01_sfnt_off00007470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7470 18772 bytes
SHA-256: bc975d0cd3d1d09474d4302e54d359df6d5266f7e81f0636855fd998b44c4aca

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